Bro these are probably the shittiest hitboxes known to man.
Also, I beat level 8 and got taken to ANOTHER level 8.
The hitboxes combined with garbage timing between the fireballs and skeletons, plus the fact every world is just a reskin makes this game very soulless.
Even though it's insanely rage inducing and has many problems such as the ones you just read above, you wanted to make a platformer game, so you did. Maybe your future projects will be outstandingly better.