Fun concept. Enjoyed playing it. I was a little sad, that you could brute force most levels by tanking damage and sprinting through everything though.
From your thumbnail I expected the player character to be a bullet, which would also make sense gameplay wise. Maybe a rocket even, so the thrusters would take the place of the abstract "reflect block".
Not sure if I missed something, but the stamina meter mechanic seemed to have room for improval. I barely tried to manage it, since there was no active way to regain it quicker and I could keep sprinting when it was drained.