The idea of losing health if the time bar is full is interesting, adds some tension to the gameplay, I liked it. And the little narration complements it nicely.
The special ability slowed down the movement when it hit stuff however, not sure if it's intended.
Leveling up and shooting even more bullets was a nice touch.
I liked the level and bullets/enemies graphics but the HUD felt a bit incoherent. I think choosing colors for UI elements from the same palette as the level could help, and it seems like an easy fix.
There are some nitpicks, but I had quite a bit of fun playing!