To answer all this:
The floor being slippery was a bad intentional choice, i don't know what in my dumb woman brain told me that it would make the platforming much crazier if your character would have this slippery feeling, gotta fix that in the future.
The "spike balls" actually have the best colliders in the entire game, since i made a system that allows the collider to be the sprite itself, it's the player having a square collider that is the problem most of the time, i'll definitely try to fix that too.
And yes, i did get a ton of comments on the last level, and you guessed this super right, i beat this super easily since i made the game and thought "ah, this is so easy, i can keep it like that", and never stopped to think about first-time players, the timer has actually been made longer in a messed up early release of v0.35 on my patreon (free if you wanna check it out hehehe) so that problem is luckily fixed.
The resolution is a thing i can't really figure out, so i have been delaying it 'till i get to v0.5, i have been wondering for long what other player's resolution is like, because from what i'm getting it's smaller? Send me a screenshot if itch.io allows you to.
And about the final screen, it's meant to be silly or scary hehehe, that's just a weird personal choice, expect it in the end of every update haha.
Thank you for the feedback! I can at least tell you that one thing i can try to fix as soon as i can, is the slippery floor.