What makes a level unenjoyable?

for reference i am trying to make as unenjoyable a level as possible :)

basically a remake of superhatemeworld, same song and stuff, but i'm trying to make the level genuinely awful to play. i've added 2.2 ship physics, slight gravity setting changes to mess with your muscle memory, horrible chokepoints, and the first and last 10% are going to be way more difficult then the other parts, to make it feel like you're never getting anywhere, and you'll never beat it. (difficulty is intended to be 300-900 on aredl)

i need more ideas