To be clear, I did use Unity, but all of the scripts were coded by me from scratch. I'm a pretty novice programmer, so I had a lot of hang-ups that slowed me down. I'm using game jams to try to get better at it.
I tweaked the difficulty a little bit and fixed a couple bugs if you'd like to try it again. It's still not perfect, but that's all the time I have to dedicate to it. I'll just have to wrap it up and move on!