Amazing entry! It's the definition of focusing your energy where it counts.
The gameplay loop is easy to grasp and very rewarding, even more so with the chunky sound and particles. The reaction times are perfect.
I'm sure it's because of time restrictions, but what undersold the game was the hand graphic that is what the player sees the most. It's not polished or animated as well as the enemies and items. The game over screen seems rushed too.
But honestly, I only point to these details because simply adding more variety and complexity to the level generator would totally make a fun full game experience. Top notch work.