Hey! Great little platformer you made here! The art-style is very cute and I did not have a hard time learning how to play the game. Your SFX are spot on also.
One thing I noticed is level 2 seems a bit too hard for a second level. You want to make sure you keep your players in a state of 'Flow'. Granted this is different for every player, but ideally going from something very easy to something a good bit hard such as your transition from Level 1 to Level 2 is something you want to avoid.
Great work! I am happy to review/critique any other games you have!