For a first game jam, and a second ever game, it's pretty good. I liked the concept, and the graphics were nice. Wish it had sound effects though.
The real issue is it takes too long for the game to get interesting since there's so few bullets shot out at first, and afterwards it's only fun for a while before it starts to get repetitive. Maybe add other bullets with different bounce types, or add walls that change how they bounce after a certain time?
Overall, it's pretty decent, and still quite fun.