1.7 gb, microsoft virtual c++ runtime, UE prerequisites and a driver update is crazy for a game jam game.
I feel like a 2D or third person 3D would fit better. The climbing routes keep interrupting momentum, which isn't great for a parkour game. The absence of wall runs or climbs makes the focus on verticality even more puzzling. The parkour system in question is pretty clunky, it seems possible to do slides and vaults, but they seem to be entirely environmental rather than tied to hotkeys. This isn't a huge issue since ledge grabs are the main that the map is designed around, but those don't feel super consistent either. 
The core design of delivering packages between points and returning to a shelter is good, but the map design really does not fit well with the movement system.