I also had the left issue, seems to be something quite wonky going on with the aiming, as it sometimes does not seem to follow my mouse pointer correctly.
Overall, a great production! Good visuals, fitting music, and even a intro! Very Impressive for a short jam. While game-play is personally not my thing, the idea is not bad. You have a step-by-step tutorial (that I feel should be shown ones, not every time I die), a very spacey feel on the jet-pack, and really like the addition to the power of the jet-pack. I do feel however, its almost to hard to control, as mentioned, the game-play did not click for me, so I might just be bad at it, but with the issue i mentioned first, I always felt that I floated quite uncontrollably. It does not make it easier that you have shooting enemies and that crashing means instant death (something I would not mind if the controls where a bit tighter). It sadly creates a rather frustrating game-feel. Might need to be tweaked, but its highly subjective.
Something that I do feel needs improvement is the intro, while awesome that you have one and gives some nice context, It feel very drawn-out... Every frame really outstayed its welcome. I think being able to skip too the next frame would be a very nice edition, if only for not having to see it all again if you replay the game.
A very great production, if a bit to difficult for me. Cheers!