This is a really good entry! The graphics are super clean and everything fits well together.
A few small things:
- Some levels got really hard towards the end just because of the time constraint. Maybe you could make the big guy move a bit slower, or find some other way of giving more time to the player?
- An auto-restart when dying would be nice instead of having to press R
- The trigger for going to the next level could be a bit closer to the edge of the screen, to prevent having to walk off screen too far, but that's really a nitpick
Great work!