I have bought this game 6 years ago, the full price 4-pack for myself and my friends, and I still consider it by far the best value on any game I have bought or obtained. Its content has more than tripled and the price is still the same, and the only DLC has no effect in the game itself, which is more than most games do nowadays (in fact, the only real "locked" content is a collector's edition bunny pet which has no effect on gameplay and can be enabled via registry editing). The dev team is still quite active (though lately somewhat secretive with the upcoming update) and the modding community creates even more longevity for an already amazing game.
Many people will say this game is similar to a 2D Minecraft, and for the early game it holds mostly true, being an adventure sandbox block game with building and crafting, however once past the early "bows and swords" part of the game, the difference becomes obvious: Terraria is much more focused on combat rather than building, the latter of which is Minecraft's forte.
Graphics are simple enough, being pixel art with a charming style. Landscapes are good looking, with slopes, waterfalls, and cosmetic waves in liquids
Terraria, being mostly focused on combat, has a real sense of progression over just "you hit things harder" like other similar games do. Progression starts with you being slow, barely able to survive a night without shelter, and end with you flying across the world fighting cosmic horrors, and despite the large power creep the challenge throughout the game until the final boss is defeated remains mostly the same as basic enemies require more strategy to defeat, or a weapon that can kill them before they can hit you. Every boss is unique (even though there are hardmode remakes of early bosses) and requires its own strategy, and the many events in the game provide good loot (apart from DD2 crossover ogres, apparently).
For those who enjoy a challenge, there are a few ways to make the game harder, from character options ranging from the default softcore lose money on death, to mediumcore lose your inventory on death, and to hardcore, lose your character on death, to world options like expert mode. Expert mode essentially does three things: it boosts enemy stats and banner buffs to compensate, adds some unique enemy AI, like armed zombies, bone throwing skeletons, or spike slime bursts, and increased boss challenge, with enhanced AI and multiplayer scaling, with unique expert mode exclusive drops and the treasure bag feature, which makes bosses drop one bag per participating player, containing over normal mode's loot plus the unique item, which can greatly reduce the need of boss grinding, especially in multiplayer.
My only real gripes with this game are the Guide NPC and the overreliance on RNG. The Guide is the only way of looking up item recipies without using the gamepedia, and the UI for it has no sorting or categories whatsoever, which may make it hard for a first time player to play without using the wiki. Meanwhile many good items are hidden behind low drop rates which can make the game very grindy if you want a specific rare item.
Overall I consider this game one of the, if not the best indie game on the Steam store (or even in general), with a fantastic value, tons of gameplay, and lots of user made content once you think you've seen everything.

I have bought this game 6 years ago, the full price 4-pack for myself and my friends, and I still consider it by far the best value on any game I have bought or obtained. Its content has more than tripled and the price is still the same, and the only DLC has no effect in the game itself, which is more than most games do nowadays (in fact, the only real "locked" content is a collector's edition bunny pet which has no effect on gameplay and can be enabled via registry editing). The dev team is still quite active (though lately somewhat secretive with the upcoming update) and the modding community creates even more longevity for an already amazing game. Many people will say this game is similar to a 2D Minecraft, and for the early game it holds mostly true, being an adventure sandbox block game with building and crafting, however once past the early "bows and swords" part of the game, the difference becomes obvious: Terraria is much more focused on combat rather than building, the latter of which is Minecraft's forte. Graphics are simple enough, being pixel art with a charming style. Landscapes are good looking, with slopes, waterfalls, and cosmetic waves in liquids Terraria, being mostly focused on combat, has a real sense of progression over just "you hit things harder" like other similar games do. Progression starts with you being slow, barely able to survive a night without shelter, and end with you flying across the world fighting cosmic horrors, and despite the large power creep the challenge throughout the game until the final boss is defeated remains mostly the same as basic enemies require more strategy to defeat, or a weapon that can kill them before they can hit you. Every boss is unique (even though there are hardmode remakes of early bosses) and requires its own strategy, and the many events in the game provide good loot (apart from DD2 crossover ogres, apparently). For those who enjoy a challenge, there are a few ways to make the game harder, from character options ranging from the default softcore lose money on death, to mediumcore lose your inventory on death, and to hardcore, lose your character on death, to world options like expert mode. Expert mode essentially does three things: it boosts enemy stats and banner buffs to compensate, adds some unique enemy AI, like armed zombies, bone throwing skeletons, or spike slime bursts, and increased boss challenge, with enhanced AI and multiplayer scaling, with unique expert mode exclusive drops and the treasure bag feature, which makes bosses drop one bag per participating player, containing over normal mode's loot plus the unique item, which can greatly reduce the need of boss grinding, especially in multiplayer. My only real gripes with this game are the Guide NPC and the overreliance on RNG. The Guide is the only way of looking up item recipies without using the gamepedia, and the UI for it has no sorting or categories whatsoever, which may make it hard for a first time player to play without using the wiki. Meanwhile many good items are hidden behind low drop rates which can make the game very grindy if you want a specific rare item. Overall I consider this game one of the, if not the best indie game on the Steam store (or even in general), with a fantastic value, tons of gameplay, and lots of user made content once you think you've seen everything.