Interesting game! I could see this doing well. I absolutely loved the music even if it wasn't necessarily original, and the art was basic but for what it was, good. I think I'd mostly recommend finding a way to only spawn squares somewhat apart from the player: I took a number of hits purely because I had a square spawned under me. Love the screen shake too, and as the funny little conversation by the indie dev goes: Question: "How much screen shake should I use?" Answer: "Yes."
For a first-time GWJ submission, this is quite high quality. Well done, keep it up!