This was bite-sized, but fun as hell nonetheless! I like the atmosphere, and mechanics within the game. If I had to recommend anything, it would be adding an 'R' to restart option for convenience, since one often uses WASD, and R is within the index's reach. The second would be adding a turbo mode, where everything moves a deal faster. The third is more an idea than anything else, but you should totally make an endless mode for replay-ability and competitiveness.