About momo fight... I think it's pretty fair, but i would make delay before her homing bubbles attack a bit longer, cause sometimes she spawns them right in the middle of a roll animation, and i would make her hitbox wider, so it would be easier to shoot her with bow while she is on platforms. But firstly - take your time, there is no point in balancing a game while it's not finished, and rushing it's completion is not a good idea as well.
Love your work ❤️