This is the /r/WebGames jam...so why can't I play it in a Web Browser? It kinda defeats the purpose.
But onto the game itself; it's pretty fun, I like that each of the buttons you indicated has a cheat power at the cost of activating super hard mode. I think I get why you picked the keys you did but its a little difficult with one hand on the key pad and the other on rest of the keyboard, if you used WASD for movement, I think you could get some really high scores since both hands would be on the character keys. If you keep working on it, I think this could be a really fun endless runner type game (like Jetpack Joyride or Temple Run)