Right, well were to being?
I've been sat in front of a machine for 3 days. Didn't start coding till the last day so I spent waaaay too much time fooling around in Photoshop.
I finished the Unity build with 10 seconds to go.

Still I had a clear Idea and you may be able to glean just a smidgen of it from this - if you can get the downloads to work.

Few things missing - Sound - no time.
Goals - no time.
Victory - no idea, this has not been play tested at all.
Death = possibly. Not play tested.
Bugs - Yes, it's at deaths door

Apart from that here is a list of things that should have been in there if I'd had more time.
Artillery strikes with booming sounds and lots of flashes - dirt being kicked up.
Proper graphics for the room backgrounds with some nice lighting effects.
Animated characters.
Dialogue with orders - pictures of the cast etc..
Story.

Well, this is as far as I made it in 72 hours.

It's not so much a game as an interactive idea for a potential game.

Oh yeah, arrow keys to move, space to jump.