It definitely had an interesting story and the art was a nice presentation of that. I liked the wild satire of it for sure!
My biggest issue was that when you attack the tank goes down. But I never figured out how to make it go back up. Sometimes standing around would refill it. Other times when I started to walk around it'd refill. The health packs which I was confused by because I didn't think the enemies attacked and I didn't see a health meter; but that'd give me some gas back. I pressed every button to find a refill button and searched the map for a more clear answer; but I'm still confused on it.
Good job on finishing though! And I feel the energy drink part, a couple Swiss Chocolate Monsters a day keep the sleepies away.