Balance still need a lot of work I didn't have enough time. The AI makes intentional mistakes, I was afraid it was too unforgivable. After lvl 20+ it's supposed to take the best solution on every move but don't make long term plans.
My god, of course you didn't have enough time! Balance is so much work. You did this for LD, it's insane you already got so much done! Oh, I'll try some Lv20 gameplay then, I only got to lv 15 or so for now! Sorry I shouldn't have worded it like, "the AI isn't very good" but like, "it's going to be hard for an AI done in a week-end to help as much with analyzing the game and pushing it to its limits as a human opponent would" (because you're pushing each other to improve), and also because you can't chat with the AI to discuss moves and theory craft (and also because I think the game is probably a bit more complex to play well than it looks?)