This is a solid game. Its fun, keeps you on your toes, give you options for customizing your robot, and switches it up with different enemy types. The healing mechanic is also a quick little mini game that made me feel like robot that was repairing itself. Very enjoyable.
There were a few things that could be tweaked. The sound of your rapid fire is a little low. At first I thought there was no sound at all. Occasionally enemies will spawn in front of doorways and you will injured right away. I was also unsure how much health I would get back after healing. It seemed like I could never get back to full.
Overall, these are details that just need more time to ironed out. The core stuff is solid. Well done!