Good up until the gravity jump part
Then everything fell apart.
The controls themselves were awful, but I found out you could change them so I'm not marking down for that, but once the gravity jump became active, the game was literally unplayable. I couldn't go anywhere without dying. Mostly because the gravity switched automatically whenever you were sticking to walls, rather than just when you jumped.
I just began zooming in every direction, unable to react in time before getting slapped around by everything and dying in 10 seconds. I eventually just gave up.
Until that point I was having a lot of fun, and the music was nice, but unfortunately I can't enjoy the rest of the game because this isn't just "difficult" once you get the gravity jump, it is literally impossible to play.