First of all I must say, you have an absolutely gorgeous game here. The pixel art and ambient music come together fantastically. The choice of brilliant blue stars for the background was great. Your game page looks great too!
For gameplay, it was an interesting choice. Once I got the hang of it I had fun bouncing off the walls. Having the tutorial being on that screen at the start was fantastic.
I had some trouble at the start because I thought that "walls" included the background wall and I was confused at whether I was doing it right or not (I wasn't lol). I also thought that some of the inert objects in the first room were actually the power cells, so I wasted a lot of time trying to grab them. As I progressed through the game, sometimes I would get stuck in the centre of some of those huge rooms because the air resistance slowed me down, so I was left wiggling.
It was rewarding once I got the hang of the movement though - I was zipping around and enjoying the sound effect of trying to turn on the gravity without all of the power cells plugged in. What a cute beep and wiggle!
Anyway - overall a fun game! Great job for being done in one week :)