upgrading takes too long, in my opinion. i spend more time with upgrades than i do playing the game. could you maybe make a way to say, upgrade a skill 3 times at once or something like that?
needs badges, and maybe some more weapon variety. a rocket launcher, a grenade, a machine gun, and a shotgun don't provide many tactical options other than charging in screaming and praying to god there isn't a boss anywhere nearby.