While the game initialy is fun to play, it quickly becomes boring due to there being no raise in difficulty. To combat this, maybe decrease the frequency of platforms spawning or randomize the heights more. Moving platforms or dangers could also increase the fun.
As for the art, it is quite nice. The only thing is the fact that the player teleports to the other side of the screen if you exit on one side. If the player already shows on both sides of the screen when you are cut off will probably look better.
All in all good game with great potential! Keep up the good work