Good mechanic for platformer! But i was cofused with jumps and switch screens, because i get used to space as jump :D When playing in first i thought that line is gona kill you, and ater that i see that its not)
Also very like sounds and music in game! Simple but enjoyable art is good too.
In future think about some visual effects in your games. After level completion effect or take coins effect would be nice in these game!
Awesome game, good job!