The voiceover work was awesome! I noticed that using the end-of-level teleporter cut off the voice and I really wanted to listen to it lol. Maybe you could preserve the voiceover between levels somehow with some code.
I found the movement slightly delayed after I pressed a key, which created some difficulties in controllign battery placement and crossing gaps. Overall, this would be a game I'd definitely play a lot if the physics were more responsive and battery movement was polished! Nice work.