Thank you for playing and the great feedback!
Good point about the ammo boxes, I've been staring at these things so long that you lose track of what isn't obvious to new players. I intend to add mouse over tooltips and other indicators to many things, for example being able to inspect weapons to see their exact stats etc.
I'll change how the max perk works yeah.
Regarding the balance; well there isn't really any yet hehe, the ultra gun is intended to be really effective but burn through your ammo. I think that will be a lot of continuous work to get right, especially as I add more and better skills, guns, maps, and enemies. Getting at least one guaranteed drop on the first map is a good idea.