Really liked the idea of the game, but unfortunately I couldn't finish the game. The problem was that at the stage you get the grappling arms, after you blow up your legs, if you hadn't know that you would need to use the hover belt, you would just get stuck near the exit, because you can't move afterwards, and there were no reset button to the game, at least not that I could find one. It would also be really good to have a better feedback to the player to what parts he has available, I get the top-right UI idea, but sometimes you need instant feedback, like in a middle of a jump for example, I think you could implement something similar on the game screen, that the player could see with his peripheral vision maybe, or any other idea really, like something similar to the UI on the top-tight, but around the cursor, for example (maybe this is better, and easier to implement than the former).
I really liked your game, and it's idea. Congrats on the game!