I really like the idea of the game, it took me a while to understand that I was supposed to go on the treadmill, I thought the points was the big number on the top right.
Once found though, it was quite nice experience. Would be good to have more things to do, I felt like I managed to buy the last upgrade without having trouble on the way, I don't think any enemies reached the border.
But nevertheless that's a good idea, graphics are really nice, and I'd love to see where it goes.
Well done!