Played this on Kongregate- decent, but I was kind of disappointed, especially by how easy it was (on Survival mode, yet, and having pretty much totally fucked my starting stats (mistakenly dumping several of my starting skill and attribute points in stuff that ended up being worthless, making STR my dump stat, etc))
-At the beginning, I hoarded absolutely everything I could, seeing mentions made of crafting and trade- the former turned out to be three side quests, two of which gave me weapons inferior to the ones I had, and the latter turned out to be a couple weapon stores that I couldn't sell anything at (and never needed to use anyway). This meant that my storage was either packed and useless (pre-realization that misc items are totally worthless), or empty and useless (post-realization, as there was no reason to keep anything but the best weapons and supplies)
-Thinking that I'd need to conserve precious supplies of ammo (as Survival mode was advertised to have more scarcity that Run & Gun), I went through about 75% of the game with melee weapons (and the silenced pistol you get from the third craft quest on my ally). You'd think that it would be harder this way, except that melee is completely silent, doesn't take ammo, and I always had a weapon that could OHKO whatever I ran into (except riot shield zombies which are only vulnerable to precise headshots and explosives, but see below). By the end of the game, I had ~500-700 of every type of ammo except fuel and explosives (former I only found one shitty weapon for, latter I found like 3 grenades/rockets in the whole game, but again, see below).
-Allies are broken, figuratively and literally. When they're not getting stuck in their run animations and being completely worthless, they're infinitely replenishable (ED: as long as you don't die at the same time as them, apparently) meatshields with infinite ammunition. As soon as I found the grenade launcher (a fixed drop in a military crate if I'm not mistaken, if you don't find one sooner- I never bothered to complete the police armory quest) and a sharpened katana, I knew I'd beat the game right then and there, as I could now one-shot everything in the game (especially when I swapped my ally's launcher with an RPG I found a bit later on- pretty much the same, but faster reload and twice as much damage (as if it mattered)).
-Survival mode's scarcity wasn't, especially after I hit ~50 survivalist. Aside from the ammo issues above, food and medicine (and skill books) were always plentiful, and I only had to sleep two or three times (but then, I never came close to dying, anyway). Once I had the aforementioned weapons, I skipped looting the last three or four areas of the game entirely, just so I could get to the end.
-Sporadic lag issues, and not just with the ceiling zombies. Since I killed every other zombie I found, I figured I'd do a fighting retreat across the bridge (since I knew it was infinite)- except that it was laggy as balls, and my ally'd got stuck in her run animation again.
I'd be willing to try the game again if it's been updated (and I don't mean new weapons and areas, i mean fixing things), but I can't help but feel that it was rushed.