Using the black hole gun is really fun, i see a lot of potential with this mechanic. But:
1. Using the camera is kind of difficult.
2. I don't know where the enemies come from and i always have to search for them. It would be cooler if several robots follow you at once.
Other than that, i hope you develope this further, if you fix these things and get better graphics this could be a really cool game.
I hope my feedback helped you, it would be cool if you could check out my submission too. Thanks! :)