It was a really interesting game to play. The idea of separating the game in two phases (collecting and protecting) was very interesting, something we don't see very often. The tutorial was concise, really straightforward, which is nice.
The art of the game is fun to look at, love the "hotline miami" feet. My only complaint is the lack of sound. It's all right if you don't know how to compose songs, but you can try at least some sound effects recording random stuff by yourself or looking at sfx generators like bfxr.net.
Overall it was a positive experience. Congratulations for your first game jam!