I absolutely love the humor and art style of this game! Spinning fast in the chair and bouncing off of objects is really fun! I love the slowdown too when you defeat an enemy.
The one thing I'd suggest to make this game a little more satisfying is visual effects when you damage an enemy. You have a good sound effect for it, but making the enemy flash red or white with a little particle effect would go a LONG way! Your game is already really visually pleasing with great style, and this would help push it over the edge.
Amazing job!