Good, but
It's fun for the first few levels; there's some real challenge there and you get a nice sense of progress buying all the upgrades. I worked my way up, first magnum, second pistol, second magnum, then everything on the upgrades screen; all that was fun. Then I bought the deagle (with the spoils from one round, with all the upgrades) and the game ceased being terribly enjoyable. I never even bothered with anything automatic, or the shotguns or laser. There's nothing wrong with a ridiculously overpowered weapon, just scale the costs better so you can't get it until later in the game. Also maybe make us buy the reload/power/etc. upgrades separately for each weapon tier--so you buy them for the S&W magnum and the first pistol and shotgun and everything else, then have to buy them again much more expensive for the middle magnum, then again even more expensive for the deagle and other third-level guns? Just some suggestions for a sequel. I've loved Diseased since Thing-Thing 1, and zombie defense games are my favorite; this is great stuff.