Interesting game idea and nice use of the limitation. Took me a while to figure out the hypercharge mechanic but once I did the gameplay got really exciting. Great job.
Just a few suggestions, maybe the tutorials can be shorter. Player has to complete the entire tutorial level even after understanding the mechanic (if there was a way to quit it, I couldn't figure it out).
Also, the robots that are in enemy mode can have a different color (like red), and once they are taken over the color can change to the player character robot. This way you can add more different variations of enemy robots and allow the player to take over them to increase engagement.