Nice job! All around, a good experience. I will say, I wasn't sure if the mastery trees started at the top or the bottom for some reason, even though the bottom upgrades were simpler. The linear gain of 1 point per round made it hard to upgrade multiple weapons, and even though I have access to 4 different guns, I felt like it was most rewarding to stick exclusively to the one I had upgraded. The art was good, and I didn't notice the music being repetitive or anything. Again, nice work!