So, this will be my opnion about this game. I've beat it. Finally. (Without light effects. I got framedrops because I runned some other stuff in the background. But I didn't want to run this very game only ... like, you know ...)
For starters, the Kitty Zombie was a nice feature of the game, but it was kind of difficult to use her as a Zombie Proxy. You've to consider her Heart-Meter, your own position, the position of your target and the position where the light stick lands. (Damn!)
Sometimes, there was just a crowd of Zombies too big to shoot/hit through. So, skipping that crowd would come in mind but here and there was a collision detection. Especially the "Wall"-Zombies. Neither jump over them or crawl under them was possible. (Or maybe I didn't try hard enough?)
Furthermore, it was - honestly - a pain on the nerves to switch the weapons via a key. May it be because of the programming. My. Left. Hand. Hurts. When I fought the last boss. Ammo empty? Switch. Ammo available? Switch. Ammo empty ...? Oops, I'm not shooting.
But, the boss fights made fun. The first one was more like tank-and-shoot. Just shoot. Getting damage? Who cares - shoot! The second one was nicely done. The third one was challenging - I could feel the Dark Souls feeling.
Animation work is excellent. H-Animations very spicy.
So, all in all, it was a game worth playing for the content rather than the porn - the plot was short but still interesting.