I'm not a game designer, but I clearly see that this game has it covered!
In-game tutorial is brilliant - when read instruction for shooting mechanic, you instantly try it and see the result of it (unblocked entry). And then you got one enemy and you what to do with it! I think Half-Life 2 has the same cool approach.
Graphics and visual style is very cool! Totally like the game!
Btw, why do you have 7 confused people in the team? :D