Hey, nice game! The art and animations are fantastic.
I have some notes, if you don't mind:
- The game lacks feedback, like, when the player is hit or when the player hits an enemy. For example, you can make an enemy's sprite flash when the player hits it. You can throw the player a couple of units back when hit or make a hurt animation (even one frame is enough, especially when you combine it with throwing back and some sprite flashing);
- Would be great if I could shoot when moving backwards. For example, right now, if I move right then I have to press 'fire' in the half of the screen I am facing;
- I didn't get how the rewind mechanic works here. I pressed 'Q' when the coin was active, but nothing happenned.
Anyway, good job!