Hey there, I had a chance to check your game out, and I enjoyed my time playing it:
--------------------------
What was good - I really liked how the general atmosphere of the game. A sort of mix between a typical puzzle-based platformer; and the rocket Switching mechanic was an interesting addition.
The art was pretty nice, so good job there :)
-----------------------------------
What wasn't so good -
The Audio levels were a bit high overall.
The Audio was a bit jarring for the rocket, one would even say a bit annoying. It sounded as though it was clipping - that is, going above 0 dB and flattening out the peaks.
As for jumping sounds, it was okay, if a bit repetitive. If you added a pitch randomizer to it, that would have made lt a bit more variable. As you will be doing a lot of jumping, getting everything in order for that is rather important.
On the subject of jumping; I found the wall jumping puzzle mechanics were just a hair too unforgiving, requiring a far higher precision to get it right than it needed to be. I found it to be a bit frustrating at times, especially when I made a mistake later in the level that reverted me to the very beginning.
The amount of fuel in the rocket is annoyingly low. Consider spacing out the level more so there is a longer interval of using the rocket before having to switch gears again.
-----------------------
Overall, it was an okay game - Not exactly a game I would play for hours on end, but one I can pick up and spend a half-hour trying to get to the moon every now and again. Good job :)