I think the difficulty is a bit random because sometimes you can get a lot of boxes quickly and sometimes you get screwed by the rng, haha. I was hoping the borders of the characters were enough to recognize what they were (white: player, black: ally and boxes, red: enemy units and bullets) but I'm sure I could figure out something to better distinguish them (since the sprites are so small, after all). Yeah, a lot of places I could go from this prototype, I'm not 100% sure how It'll end up being if I keep developing it.
Thanks a lot for your comment!