Honestly, I didn't see what was so appealing about this. I think its weakest part was how you weren't able to do much with the upgrades. They seemed to mostly just fire in random directions. The graphics didn't come off as too appealing either. I was weirded out by how there were no colors. It just came off as shoddy.
I guess there's really nothing that bad about the game. The sound effects are nice. You would be surprised at how some of those blasts can catch you off guard. You seem like you could make this a lot better. I guess the monochrome title covers the lack of color.