The game is fairly simplistic and honestly as far as idle games go, I wouldn't rate it 4 stars. But adult idle games have a tendency to be absolutely shit and kinda lower the bar. If you like idle games this one is... decent. Far better than most adult idle games, but notably worse than most good idle games out there.
The game has 4 systems you're playing. You've got your primary resource (cells) that you increase passively from buying upgrades. Standard as hell. Only notable thing here is that most games give some kind of scaling bonus to older upgrades so there's some point to continuing to put points into them. This one doesn't. Getting the next upgrade is always the right option and the moment you do, spending points on an old one is strictly sub-optimal.
You've got genes that improve your clicks. They are their own separate resource that isn't influenced by your cells in any way. Just an entirely disconnected ascension path. Kinda weird, but not terrible.
You've got neurons. Buying them gives multipliers to your clicks, but not passive generation. In fact, they passively lower your cells. And once you buy them you can't turn them off. The game warns you before buying them and they're pretty easy to manage, but it's technically possible to game over yourself with these by going so negative you can't recover.
Then you've got evocytes. Probably the most contentious part of the game. The more cells you have, the stronger enemies will spawn and you have to kill them with clicks. They drain cells over time with stronger enemies draining more cells. Killing them gives evocytes and get enough evocytes and you can prestige. Getting evocytes doesn't give any bonus, and getting more than you need to prestige is entirely wasted.
Prestiging gives you a linearly scaling multiplier to all of your resources. Feels kinda week to go from 4x to 5x after doing a whole run, but honestly the game will probably be over around then anyways. The scaling for prices on upgrades is pretty flat in the first place, so the prestige can't be TOO powerful without completely breaking the game, but the whole thing so flat does feel pretty underwhelming.
The games biggest problem to me, is a failure to properly convey what it's trying to do. Most idle games will give some method of playing passively and some method of playing actively that is stronger but requires active attention. This game does that, but doesn't explain it while doing so. Neurons only boost your clicking power, but it doesn't tell you that. It just vaguely says they're a multiplier to your cells. Which isn't really accurate.
If you want to play passively idle then picking up neurons is an active debuff. Killing the early weaker enemies is an active debuff because they'll be replaced by stronger ones that drain you more. But since the game does a poor job of explaining that you'll almost certainly doing them and forcing yourself into active play. Which isn't a bad way to play, but in this game it creates the illusion that it's the only way to play. And it doesn't seem like that was the intention.
Another complaint would be that the disconnected growth of your click power and passive generation doesn't feel good. For instance, if your passive generation has gotten way ahead of your click generation, getting the next big upgrade for clicks will be entirely insignificant to you and feel pointless. It turns half of the upgrades into nothingburgers most of the time.
Despite all that the game is decently tuned and generally fun if you understand what the game is trying to be. It's very much numbers go up, and the fact that you have a creature that slowly evolves into bigger and more complex forms works well at conveying that in a way that numbers alone struggle to do.
On that note, and this is strictly preference, the game starts you with basically an ameoba before turning into basically a small animal and eventually a humanoid creature that's moderately attractive and fun, but then it just keeps going as it warps into some eldritch abomination. Both sides of that feel bad to me. On the one side, even they turn into a person, they were a dog a second ago and it still kinda feels like your fucking a dog. On the other side it begins to feel like you've gone too far and created something truly horrifying. The second of those seems intentional and fine thematically, though a bit of a turn off for me. The first seems like it's just a problem.
Some basic text bubbles as the creature develops could help with that, both in the sense that you could make the whole thing feel less like fucking a dog if it's, I don't know, whispering dark cryptic secrets or threatening to murder your family. It would also help set the tone more. Just my opinion though.
