I am blown away by the fact that you managed to create a multiplayer experience within 3 days, amazing job!
I also had trouble getting all the info out of the tutorial but once I got the hang of the controls I had a lot of fun. I was also playing with someone in the same room as me and we laughed a lot which is a great achievement.
I also had to alt+tab to get out of your game which is a bit annoying but it's not a "fatal flaw" of the game and I totally understand that you were tight for time and might have not been able to implement it. It would be a nice update though.
Good job!