I like this one! Jetpacks are underutilized in games in general, I think. This has a lot of potential. I do have a couple of comments. Why have the arm at all? You can shoot all the switches, do we need the ‘arm’ option? The gun feels really weak, in terms of having to stand there a while and defeat the random spiders thanks to the small damage per shot and the lengthy invincibility frames. Also, I would have liked the ability to walk without the jetpack, or at least not always launch forward after I hit the ground. I found controlling it to be a bit of a challenge. Maybe that was the point, but if so I failed to realize it was the point and it wound up a bit frustrating instead.
On the other hand, there’s a lot of content here for a jam game, and I like that you even had a story going on. The spider boss was a lot more challenging than I expected at first! Good job.