Some Suggestions
The little ball that you controlled moved very slow. Just getting past the fist level took some time. Also, whenever you messed up a lvl you had to go all the way back. Sure this is challenging but when you make it so that there was no screen in between levels it kinda sucks. Basically if you were to move across level one for example you would hold down the right arrow key. The next level would start off right away and you could go right into the wall and have to start over (yeah I know, OMG level 1 and I have to do it over but this was just one thing). Basically the guy moves slow and the changing between levels is sketchy.