As a Cave Story fan, I was very happy to see the inspiration for the game in the form of the pixel style and the sound font that the game used. The game itself plays well, although there are a few notable issues.
Allowing Larva to aim in both directions would streamline the gameplay slightly more. The movement also felt rather slow at times, especially the acceleration, and the readability of the up & down boosts suffered from a slight lack of distinction.
I did like playing the game otherwise, however, between the visual style of the characters and the otherwise (relatively) smooth controls. Well done on this one!