No problem, long reviews are just kinda natural to me so I'm not trying I just have a lot to say lol.
Well fair enough on the difficulty, I didn't quite get it right either as you know XD. Sadly I don't have many ideas on gameplay, it is indeed hard to make ai feel fair using abilities as you don't want to create mario kart, the only duct-tape solution is just having a few basic abilities like dash or just placing a small wall down but yeah I can't think of many great things, mind you while writing this I just thought of permanent stage drops, like being able to place down a speed boost pad that stays there the entire map and other such things like dart traps that fire every "n" seconds in a straight line so you want to avoid that path when heading to the center, basically I'm thinking of the game "ultimate chicken horse" a little with this. Of course I hear you may not go forward with this project which yeah I imagine very few people will (me somewhat included but I think my main mechanic has potential so perhaps after some more jams and I've improved my skills I might consider it), so completely understand!