"Project Kat - Paper Lily Prologue" is not a game. It's an advertisement for a product called "Paper Lily". Paper Lily is an RPG construction kit asset flip slapped together badly, but never finished, the first chapter was dumped on Steam as another advert for the product which never eventuated. Like all JRPG construction kit garbage, it's just a collection of complete cringe high school anime club dropout writing with assets ripped off from the construction kit, plus a few really crappy low quality 2D assets that may have been sourced elsewhere.

But this isn't completely relevant because this is not Paper Lily, it's just an advertisment for it, so it's not correct to try to review that completely distinct product. We must instead review this for what it is... an advertisement. If you enjoy advertisements, you can consume them for free on the web or on Youtube without needing to add them to your game library, download them, and then launch the advertising. It's impossible in a general sense to recommend people should do that over playing real, full games on Steam, and that applies here with "Project Kat - Paper Lily Prologue" too.

The purpose of this advertisement, given there's no actual product to buy, is just to get you to give the "developer" EIGHT BUCKS to support them... wtf? They want you to pay them $8 for this advertisement. What a joke. What weird beggarware.

This is only free in the same way that adverts on Youtube and banner ads in your browser are. This is a game demo that's been dumped on Steam to advertise another Steam store page in the hopes of raking in some cash. Just because advertisements are free, doesn't mean they're worth your time.

It's important to understand there's a formal process to create a demo/page for a game which hasn't been followed here:

https://partner.steamgames.com/doc/store/application/demos

While it might seem like an inocuous mistake, publishing demos and advertisements as if they are full games is misleading and in some ways harmful. This advertisement is taking up marketing space and visibility that would be better made available to a developer that's done the right thing and created a full game. Instead, that visibility is given over to a demo/advert that's been published incorrectly and is polluting the marketplace.

It's unclear if this mistake was made through incompetence or a deliberate intent to mislead gamers. Often developers may choose to incorrectly publish demo/advertisements as separate games as a cheap way to bypass paying Valve for marketing presence on the Steam front page, which may seem clever to them, but it's harmful behaviour and it's not good for gamers.

Advertisements and incorrectly published demos don't add +1 to your game collector count, they aren't full games. It's impossible for me to recommend this incorrectly published advertising spam to gamers, you deserve better than adverts.

This was AWESOME, i recommend everyone to check it out.

As a Paper Lily fan, my unbiased opinion is:
You should play Project Kat (and Paper Lily!)