You made this in a few days!!?? Very nice. For a new developer such as me this is inspiring, nice job, Did you follow some tutorials or?? Please add tutorial before the game starts or something, because i red on game's page that there are upgrades and i was playing and wondering when will they appear. I don't mind clicking esc and upgrading in upgrade shop but since i didn't know it took some time to figure it out, but a reminder of some sorts would be great :D. Also i would increase default fire rate just a bit and maybe slow down enemies, or rate that their numbers are increasing just a tad, because i find it slow in the beginning and it can be little frustrating. Overall, very nice, i'm in beginner stages of learning unity and i like to figure out how things work before making games, but as soon as i get some experience i think these one week games are pretty good idea. Rock on!