Great first game!
If this really is your first game, great work! Well, heck, even if it isn't it's still great :) Few irks though. Aiming was a little strange. Even after repositioning myself, I couldn't hit certain zombies. For any review that say "aiming sux" or "bullets don't go where they're supposed to"... ONE, there are multiple lanes and I think you're thinking 2-d plane as opposed to a 2.5d plane and TWO, guns I believe have programmed accuracy so that's that. Another irk I had was weapon power...I only played once to get all weapons so I don't know if weapons are random or not but as you got more weapons, they didn't seem to get more powerful. The last two "standard" weapons were very meh-ish. In fact, getting the sawed off shotgun was my main gun (until the "end" of course). Guns could use tweaking or at least move the guns around :) Great work again!