Well, if you want some constructive critisism...
Well, if you want some construcive critisisim, I can tell you that you should probably add something like "FOR EVERY 100 SCORE POINTS, 1 ENEMY IS ADDED TO THE GAME TO CHASE YOU". Also, you should make it so that there are levels in the game after a certain number of points and we should be able to look forward to something when the game is done, such as, lets say, different types of units we can use to collect the blocks.