Great quick game! Really like the telegraphing before the gravity flips. The art style is great too. The whole game has a great atmosphere. Level design and character controls were good too. Variable jump worked for this game very nicely too.
The only thing that could be improved are the flames. The particle system felt a bit out of place and I think maybe the hitbox is a bit too big. I got hurt once when I thought I wasn't touching it. But its not gamebreaking.
Overall great game!