(I posted the same comment in Reddit)
OK this is genuinely a great concept for a game and a great first execution. The basic gameplay loop works really well, the robots control well, the music fits the game, the visuals are clear. Just for the sake of giving feedback I'm going to say some things that I personally would change.
1º) Add a toggle to the gun on whether I want to mine or heal. It's a bit annoying to heal robots when I want to mine. This happens because of the snap to a damaged robot. It's ok to have this for fights, but when I'm not fighting please let me toggle whether I want to heal or mine.
2º) Have indicator when certain abilities are available.
3º) It's ok to have a limited play-space, but I would add some decorations to the edges so that it isn't as abrupt.
Other than that, the only feedback that I will give for now is that I want more stuff. More enemies, more robots, more buildings, more materials, more everything.
I want to highlight a small bug that I found though: When you press E near a chest that has already been opened or the obelisk after activating the guardian you seem to get stuck on an invisible menu. The character stops responding to my inputs. My guess is that the game tries to open a menu, doesn't have anything to show, but it still changes to "Menu Mode". Hope it helps you determine the cause of this.
Other than that, the game was smooth sailing. Really looking forward to your updates on this one.