Cell invader

My game cell invader is for a Globaloria contest to see who can make the best educational flash game. Hopefully if God willing I'll win.
let me tell you about the game, You are a retrovirus named retro , simple enough, Your job is to travel to the center of a cell and replace a strand of DNA with a strand from retro and the cell will become unstable It will explode. The first level is like mario bros. A side scroller and you can attack unlike mario, but mario will always be the best game ever. You fight lysosomes and get to the end.