Nice game!
I saw you imported sprites, but you made the music yourself, and it's very nice!
A quick suggestions would be to make the player stop when hit, since you can keep moving after getting hit for a few seconds, but then the level will restart anyways.
Also, you should really make the spikes be more visible, they are hard to see, especially considering that they are the same color of the background. You could either change their sprite or maybe animate them so that they stand out more.
Game was rellay nice overall, good job :D