I like the ball sprite wish enemies also have something like that. Enemy AI was actually doing good but people always confuse this part. A good Enemy AI objective is not to kill you actually help you play in a challenging way. Soft blue enemies were very hard to deal while also trying to navigate.
I had problems about going up the platforms. I am not sure but I think when jumping scaling down was helping to go upper. I guess this was intended but was not conveyed well enough by game play.
If the game did not have a save system I would not have finished it. It was working strange but I am glad you put it there.
Edit: I also struggle a lot on that jumping platform and find out the tactic to deal with it very late. The biggest reason is the platforms were not behaving the same. One platform was going UP when I am BIG for example.