This is a pretty cool game jam submission. I'd like to participate in Global Game Jam one day. I thought I would share my thoughts on this game.
Your movement is very clunky. This is mainly because you are using the Unity FPS controller. That thing is terrible. There are other better free FPS controllers, but they are a little hard to find.
I would agree with other comments that are saying the jetpack feels weird. For me, it was difficult to determine how far I could reach with my jetpack. I think it would be nicer if the jump pack acted sorted of as a powerful booster. Something similar to the shadow stormtroopers from SWBF2. The weirdness also has to do with the level design. I keep wanting to jump to nearby building but I'd get stuck because I couldn't reach to where I wanted to go.
There is not really any direction in the level design and art. The city is very cool but confusing. Places I can't go blend in too well with the areas that I can reach. I think it would of been best to follow a similar level design to Mirror's Edge where color defines the direction.
I love the scale of the environment in this game. I felt like I could explore the whole city and I think that would of been fun if you expanded on the jetpack.