Having to choose between repair and attack is a solid core mechanic. It felt a little too forgiving though, even if I just sat in a hail of bullets I was still always able to just repair through the damage. I also think it could be more fun to have your themed mechanic in reverse, where the more damaged you are the better your controls are, that way you're given a chance to recover.
Always very impressed by any 3d game that gets made in 48 hours though, so nice work!