Took a chance for the sake of $5; this is lot better than I was expecting. The gameplay is fluid, simple but fun, and there's enough variety with the different levels to keep things fresh for a while. It's sucked me in for a while not because of the adult content, but because I'm having fun with the gameplay.
Jungle level is super buggy and crashes constantly though. I haven't been to make it to round 20 even once without it crashing yet.
A few comments on things I think could be improved with some small changes:
Lives/Health system - The way things are balanced it's almost pointless to give the player multiple lives. Once you 'die' on a later round and lose your drug buffs, it's almost impossible to recover; you NEED to have that 50% damage buff to have any chance past round 10 or so, and without any strength you immediately 'die' again the instant anything touches you again since you can't escape. I feel that a) you should get at least a little bit of recovery after you lose a life and b) you shouldn't lose your buffs. Or at least only lose one random buff. Otherwise why even have multiple lives?
Guns - The $300 shotgun is absolute ass. The reload is way too long for the DPS, the starter pistol is nearly always better. This is small isssue on Shack, since it means the player really only gets two guns (starter pistol and the $650 one) and it boring pretty quickly as you end up stuck with the basic pistol the entire time. It's a much bigger problem on...
Caves - Round 3-4 is way too brutal. The Hunters are incredibly hard to deal with using the starter pistol, there lots of them, and your only other option is the crap shotgun to the left which will just get you killed faster. I really feel the spawn rate should be very low until at least round 5 or so, to give the player a reasonable chance to get a proper weapon to handle multiples of them.
Otherwise really fun for $5, I look forward to any extra levels you happen to add. Please fix the Jungle though.