Woah, out of all the 3d zombie shooters, this might be the best one currently being worked on around here. The RPG system is pretty good. I've only played the arcade so far. The customization is pretty great, dig the vamp options. The body part damage is really cool too.
Some minor issues:
1: Your current health isn't really apparent, especially from behind. It's hard to know when to heal without entering the menu, there should be some better indication of your current health without needing to enter the menu. I recommend a little UI on the side of the screen that shows each body part and whether they've taken damage/are injured, with the overall health listed somewhere on it. It doesn't need to be too intrusive. I can tell the game is trying to avoid the usual UI stuff but the overall health indication is kind of essential. You could also just make the screen fade or start to tint red as you're severely damage or something if you prefer. As it is now, I can't tell if it's my blood or the enemy blood/dirt on me even from the front. Most of the injuries are obscured by armor too.
2: In the arena, I think ammo should spawn around the map randomly as you play, so there's a reason to run around instead of camping. Later on it's pretty hard to get past 1-2 waves without restarting for the initial ammo spawned on the map. The ammo drop from skill ups isn't really reliable and rewards camping, which makes the game less exciting/interesting since it just becomes a shooting gallery and praying for ammo drops. That also reduces the need for speed upgrades and such since you'll spend most the time standing still.
3: Zero round clips should probably disappear immediately when ejected, It's pretty easy to accidentally pick them up and fuck yourself over later on. I'm at wave 18 trying to find the single full clip drop between the dozens of empty pistol/assault rifle clips lol.
4: When you're in a crowd of enemies, the melee button will prioritize finishing off downed enemies instead of melee attacking, which can get you killed. Not only does it prioritize it, but it will spam the start animation instead of completing it because you're trying to spam melee attacks, lol. If the animation at least finished uninterrupted even when you're continuously hitting melee, it would be less of an issue.
5: Riffle clip spelling error, lol.
6: Well, there are a ton of bugs, it's hard to reproduce most of them though. I've had issues of not being able to pick up items, sex animations being interupted by me struggling to melee and being able to walk around while the "fuck" system is active, etc, etc.
7: Health and health conditions aren't repaired when you exit back to the menu and enter the arena again.