Smells like ripoff...
The graphics are great. Love the sound effects and music. The background and foreground mixed together confusedly sometimes, but overall the level design was nice. Controls and physics were tight. Too bad most of it is from another game.
This is a blatant ripoff of Cave Story. I probably don't have enough characters in this review to list all of the similarities (such as the main characters design, enemy design, health boosts, refill/save stations, etc). If you wanted to make a game like Cave Story, you should've made it a lot different, and gave thanks to Pixel, the creator of Cave Story.