This looks good, nice work overall. I like the bright artwork and animations. I think level 1 is actually a little too difficult. The first jump is hard to time with the enemies, I would start with a simpler jump to introduce the player in to the game. At the end of level, if you miss the jump to the platform with the exit, there is no way to get back to the beginning of the level, you are basically stuck unless you lose a life. The layout of the second level could use a little work, it seems like you made something similar to the demo I did where I was kind of randomly placing platforms and did little testing, but it's actually hard to make it up through the platforms since they are so close together, there isn't a natural flow between platforms. I would do some more testing on the design to get the gameplay a bit more natural.