Great job with the submission!
I think putting the 1000 goal is a bit unrealistic, as nothing changes as you advance. Perhaps having smaller and different levels would help, but I can appreciate how 48h is not enough for a full game :)
It's also quite clear that the background is the one moving, and not the foreground. It would probably make sense to move the floor layer to avoid the feeling that you are stuck in the same X position.