Very fun game, with creative concept. I love the overall aesthetic too, I also notice that every time I collect scraps, the shape is different, the details! The run-collect-shoot mechanic also feels good & well executed, avoiding the balls is really hard though, but I think with just sound you can raise player awareness of the enemy also enrich the experience, I can only imagine Doom's music to get player pumped up :D
Overall really solid work, love to see this expanded! Good job!