The scope of this project is impressive for being made in 48 hours. I also created a game with a similar theme (you control two characters and must switch between them), but yours definitely has far more going on in terms of animations, custom assets, etc.
Things that I noticed as I played the game:
If you switch to the other character with Tab, the window seems to focus on a UI widget, so you can't switch back again until you click onscreen (maybe take a look at whether your hud is focusable in UE4?)
I wish the mouse sensitivity was customizable in-game, since I had to turn down my mouse's DPI in order to slow it to a reasonable speed.
The characters' hands are positioned awkwardly in front of the camera, so it looks like they're walking around like zombies.
Maybe the computer could make a sound at first (or something along those lines) to draw the player's attention when they start playing? As is, I walked around the whole map before realizing that there was directions on the computer in-game.
Overall though, great job!