Great.
Ok, I love how you put some effort into this. Most people would make the generic sidescroller and that's it. But you've gone further than that.
I loved how you could buy lives, powerups and so on. It was great, a show to your commitment in the game.
I recommend in the future making the game a little more fast paced and adding some sound effects/sounds to it.
Other than that, it was fun.