Great game! The graphics look very professional and the animated GUI makes the whole game experience a lot more interesting. Additionally, I liked the small details you added, such as background particles, which fit the old factory vibe. I will say, though, that the jetpack is a little slow for my liking, and even though the decorations look fantastic, it's a little hard to differentiate backdrop/decorations and the actual parts of the level. In terms of the sound effects, the background ambience and steam/jetpack sounds match the factory setting, although, as other people mentioned, some background music would be nice.
Overall, great game! It's really polished, and everything fits together. Good luck in the game jam.