The game was meant to be hard, but i agree that the controls are not precise enough for some of the jumps required.
The hitbox thing is more from the character side more than the spikes one i think, the animation should only rotate the sprite but i think i did something wrong and is rotating the hitbox too.
Yeah the scalable windows was not there because i didn't know how to do it and when i noticed it would be a problem was late enough to keep it as it is, for the next one will be one of the first things i'll try to learn.
Thanks for trying it out and giving so much feedback, it means a lot!