I love the tank controls and fixed cameras though some of them could be adjusted. I do think the story was a bit off too, or maybe it was the pacing, I'm not sure. It just seems odd to me that anything is happening to Dave while at his grandmas house, or why the game even started with that as the introduction. I understand that this is a demo and things are subject to change but I think the intro is worth looking over and possibly adjusting.
In my opinion, Daves' mental instability needs more time and buildup for it to be believable to the player.
Thanks for making games!