MILD SPOILERS, MAYBE?
That was a lot of fun. Although it's a visual novel, it feels like it draws heavily on the classic point-and-click adventure genre and it both looks and feels (at least to some degree) like those old Flash escape-the-room games. I mean the better ones, so that's a compliment! I didn't play the most recent version so my review may be slightly dated, but:
I enjoyed the visual style, which between the intentional sketchiness and the black-and-white environment is likely what reminded me of those Flash games. The character's sprites are distinctive and evoke their personalities before you even speak to them, and there's just enough oddness to establish Purrgatory as a slightly surreal world unto itself while keeping it firmly grounded in the mostly benign, mildly irritating banality that seems to be its hallmark. The audio was amazing and the ambient music was fitting without getting grating, which is important considering how much backtracking I wound up doing; the lack of shortcuts/fast travel makes total sense within the game, as the characters literally have forever to get from place to place and the mild irritation is probably a feature, not a bug. I found the mechanics easy to understand and enjoyed the puzzles, which required a bit of thinking without being hard or unfair; they were also well-integrated into the narrative, since they felt like things I'd enjoy doing (interacting with the characters, exploring) rather than things I was doing simply to advance the game.
The writing was witty without being overbearing and much of the dialogue was convincingly natural; it went a long way towards establishing the characters and their personalities without making outright statements, and things that were revealed in later conversations felt like the natural results of earlier conversations. I genuinely wanted to help them characters and felt good about it when I succeeded in doing so. The text could be heartwarming or poignant but was also funny, keeping things relatively light despite the frankly terrifying existential implications of a potentially-perpetual Purrgatory. I appreciate the fact that there was text for just about anything you could click on, though I'm still sad on behalf of my MC: Did they not deserve a snack from that vending machine? I'm the type of person who tries to guess the twist so I had an idea of how things would play out, but it's to your credit that I thoroughly enjoyed the journey nonetheless and was actually slightly wrong about how things would end: My compliments on the red herring that was the snowglobes as I was legitimately flabbergasted when I got to the end of that hallway, which is probably just what Lucifurr wanted. You raised my hopes and dashed them most expertly, sir. The ability to determine pieces of the MC's background was also a nice touch, retaining the faceless protagonist and allowing players to self-insert while giving a bit of personalization.
Not sure how many endings there are since I've only done one playthrough, but I got the Heaven ending and it was very satisfying, which extended through the credits and the little glimpses of the cast enjoying themselves. I chuckled at the shout-outs, like the gnome and crowbar; when I saw the train station I thought about the Number Nine from Grim Fandango, or possibly the trains from The Good Place, but I'm not sure if that's a reference or... you know, just a train station. I had a couple of crashes while playing the downloaded version; not sure if this was because I was using a slightly older version or because my laptop is ancient (probably the latter), but it didn't impact me much and might be moot at this point, given the most recent version.
I thought about quoting some of my favorite lines, but that would double the size of this already-way-too-long comment, so I'll just say that I enjoyed playing this game very much, and thank you for putting it out there to be played!