Great game. Reminds me of MegaMan and Cave Story. I love the sounds, I loved the challenge. I could never get the second cheat, but I did beat the game. The way you respawn when you lose health is unique, so they're more like lives. In any case, for a game jam game I would have preferred to not respawn for taking damage but only when I run out of health. I really liked the retro looking art, and I liked the platforming. But the moving platforms were a bit glitchy (acceptable for a jam game, I didn't mind). Overall I liked this game, I even played again to try and get the second cheat, but I never did. Great job!
edit: oh and I didn't like the controls, using both mouse and arrows and space was a hassle for me, I would have liked if up arrow jumped to get rid of needing the space bar. then you just have mouse and arrows to worry about. I didn't mind Escape to pause though, since I rarely needed that after memorizing the cheats.
I hope this is the type of feedback you were looking for!