The drawing of the character is really detailed. The running, jumping, shooting are smooth and the theme of the game is great. Most of the background looks very compatible with the theme of the game, and the drawing of the enemies are also very detailed and very suitable.
Some suggestions will be I am feeling a little bit dizzy when playing the level 2 because of its starry background. In addition, in level 3, I think the red enemy is not hurting the player. Also, some plates are moving so quick making it extremely hard to land.