Podrías crear niveles, y en cada nivel poner un obstáculo diferente, incluso le podrías agregar algo para destruir las bombas y no solo esquivarlas.
También sería bueno si el jugador se pudiera desplazar en la pantalla y las bombas cambiaran de donde salen en ciertos niveles.

Block was having a horrible day. He decided to go for a brisk movement to clear his mind when suddenly bombs began flying straight at him. At first they came slowly, but as Block continued into the onslaught hoping desperately to find out who was throwing bombs at him they came at a more and more rapid pace. This annoyed Block, but he was still able to dodge the bombs quite well. Then he noticed something quite peculiar the bombs were only traveling in a small area and he could simply travel on the side in perfect safety. And so Block continued on, still perturbed that someone was trying to kill him with bombs, but feeling much better that they really weren't very good at it. Block tried with all of his might to find out where the bombs were coming from when after passing a hundred or so bombs he remembered what day it was. Why Block felt like a bit of a blockhead, it was the annual bombfish migration, known to travel in heards numbering well into the billions the flying bombfish migration although dangerous to those who get too close is quite the spectacle to observe. Block felt the awesome power of nature as he peacefully observed the migration from a safe distance. No one would ever have to know his silly mistake, and few would understand the serene beauty Block now beheld, looks like it isn't such a bad day afterall Mr. Block.

For your first game it works well, and the controls aren't buggy. However, the game can be beaten by just going to the far right of the screen and waiting there. The falling balls shouldn't be truly random, they should always fall within a certain area near the block so you're forced to keep moving. Say within + and - 100 of the block. Add in some extra threats or powerups to keep things interesting. Graphics are poor but can easily be replaced.