Really nice work! Nearly every metroidvania I do is essentially a robot being thrown away so the story really worked for me. Love the hint that you only need 2 abilities to cross the big pit, that was fun figuring it out sans-magnet. Also, it was great to play on gamepad.
My on minor complaints where the backgrounds, especially at the start, could sometimes blend in with the foreground. I still made made it to the end (regular mode) but sometimes I had trouble making sense of what were collidable surfaces. Of course this was mitigated as well by the fast respawns. It seemed to me that pressing up to save/talk sometimes took a few tries. Again not a big deal. Lastly, especially with the last boss, I think I would have preferred the boss to be all red, again so it would be easier to distinguish in the heat of battle, especially when trying to jump on it to recharge.
But all these are really minor, fun gameplay, fun story, good controls, you nailed all the big important stuff so all that’s left are minor things. Great work!