In my opinion the game does not have a lot of flaws. [...]
On more technical aspects, graphics are under average, but the game has a lot of different songs (I think there are like 100 but I can't remember where I've seen that), from what I remember I didn't like all of them but it's still impressive and I did like most of them anyway.
17 years of development, and the game is huge. I put about 200 hours on my main playthrough. The game is free and is very easily the role-playing game with the most content I've played in a long time. I've seen most of what the game has to offer during one playthrough, but can't talk about quest branchings. There are some quests I refused to get involved into, some others I didn't solve, often because I could not, and I didn't try to deal with the completionist aspects (you gain a trophy for catching every evowok, and another for reaching maximal fame I guess). I have no idea if there's an actual ending to the game or not. I liked the hard and complex approach to Pokemon, the fights don't involve big parties but as far as small party fights go the game is complex, and the preparation part especially. The open-ended quests with no way to save your game were also somewhat interesting. Overall they're tons of little systems and the game tries to take into account many things that most other games don't. The game incorporates features which couldn't work in a traditional RPG but work very well in a Pokemon-like, like the level cap for battles and the forced ironman mode (your character can't die in combat). More than often the game seems to be a very polished and well thought combination of many features the developer wanted to see in a game. It couldn't really be more niche, Pokemon being very easy while this one is quite hard, lighthearted while this one is dark and, although Fallout is specifically described as the inspiration for open-ended quest by the maker of the game, the first game you would present to some Fallout fanboy is clearly not a game inspired by Pokemon, and it's not like the character stat-based gameplay is any deep in Evowok Breeder unlike in Falout by the way. Also the high amount of content may not totally justify the 200 hour playtime, the game is particularly slow, and you'll probably end up needing to grind if you've not played the game before. This game is a game which appeals to noone, and which requires some time to get into, but for me at least it was totally worth it.
Finally the developer is currently working on more content to add to the game.