Neat! Really liked the hidden rooms with the treasure. I had no idea they were there until I bumped into them, they were really well concealed!
The shooting mechanic felt good as well, I liked the speed.
The movement speed and sensitivity of the controls feels very high. It creates a really fast and chaotic effect, reminiscent of some of the older 2D Sonic games.
However, I'm not sure if this is intentional. The aesthetic design of character doesn't give me the impression he is meant to be so fast!
Overall a good job though, nice you were able to make quite a few levels to play through too!