This game was really fun, and I played through the whole thing! I think the idea of slowing things down has a lot of potential. I noticed that with the exception of a few doors, I was able to make it through the whole thing by slowing down everything. It would be more interesting if there were more obstacles that I actually wanted to go fast. For example, you could add an obstacle that is in your way and moves really slowly, and by speeding it up you move it out of your way. The same could be done with a platform. I wonder if it would be better if there was a penalty for missing your projectile, like a health system where if you miss x amount of times you have to restart the level. You could also try experimenting with adding gravity to the projectile. You should also add a better looking background to fit more with the art. Other than that you did an excellent job of introducing mechanics and weaving them together in interesting ways. Good job on this game!