I couldn't play it very well because it was lagging and the audio was choppy (but that's not your fault, this computer is like 10 years old). Anyway, it's pretty interesting, nice job :)

At times the enemies would just disappear and then I would just lose when the time ran out? But first FPS I've played here! So awesome for trying something different!

Love the software 3D graphics. Can't seem to beat level 3.

I would recommend using sfxr instead for sound effects... fun start to a game, nice animation of the corpses coming up from the ground

Not bad, it is not simple to program an fps (even simple) in 48h without a tool like unity .
The only problem I had is that the enemy disappears when you walk past them.

I couldn't move the camera around on OSX. I could see the feet of zombies at times...

If you get behind the enemies it seems like they don't render, likely because you're doing ccw vertex culling or something. If the idea is you don't want people shooting the zombies from behind, then I feel like you should've just locked the player position to the wall and only given them left-right freedom of movement (but still let them look in any direction).

The sound effects were cool, I like the pitch changes. not sure why some people are telling you to use sfxr, don't see how that's relevant at all. Some music would've been nice though. Particle effects were neat.

Nice frantic little shoot 'em up. It was fun for a couple rounds, so not bad given what you had to work with. Good job

The graphics are functional, and the blood effects are a nice touch, although the enemy sprites don't turn to the camera, so walking past them turns the enemies invisible.

The enemies move very erratic, which makes it really difficult to shoot the last few enemies. Other than that, the round-based gameplay with the timer offers a clear objective and challenge.

Overall, it's a fun little game and I enjoyed playing it. As others have said, you can't see the enemies from behind, and once I got to round 4 they were going so fast I could hardly shoot half of them before they'd get past me (but that may have just been my terrible aim). I think you did a great job though! :)

Love the colors and the guitar sounds playing when shooting a zombie. Gives it a strange surreal atmosphere.
You might want to fix that you can only see the zombies from one side and they turn invisible as soon as you pass them...

Enjoyable and different

It looks pretty creepy :D