A couple things I noticed while playing were:
-Weapons sometimes disappear after setting an object down. Kept pressing "2" and "3" until they reappeared.
-When obelist gets destroyed and if the player is zoomed in at the same time, player's zoom stays maxed out at respawn. (I have to hold right click to zoom back out but upon release of right click, goes back to max zoom.)
-When the area is congested with zombies, reloading weapons brings the games framerates down from 60 FPS to 1-5 FPS.
Things I'd like to see:
-Customize key bindings.
-Improved optimization.
-More weapons. (throwables and traps too :D)
-Weapon customization.
-Character customization.
-More Characters
-A separate H-Scene mode. (wide range of fetishes too ;D)
-Special zombies. (Some ideas: Boss tank type zombies, sprinting zombies, wall climbing zombies, etc.)
-Bigger maps (It'd be a plus to add things like zip linings, teleporters, slides, etc. Just some ideas!)
This game plays good for a prototype and I can see potential if it becomes a polished enough. Keep it up! :)