No bugs noticed here, but...
It took me a second before I realized upgrading ammo limit REMOVES the ammo limit. At that point the money sink is removed entirely, making the total money you have by the time you've fully upgraded the minigun quite useless. Basically it starts out too easy and ALMOST trips me up by midgame, but by the end of the game I'm ready for everything.
It really need some balancing
-Rage mode turns any weapon into a machine gun and infinite ammo. (Reduce the time and remove the unlimited ammo feature.
-Adding Q&E for switching weapons would be a nice addition.
-The pistol is way too strong.
-Sometimes the round ends even when there is still one zombie left
-Crank the speed of the zombies up a bit, I just beat the first boss and got bored of waiting for the zombies
It is a nice and fun game but it does need a lot of changes, good job though.
Balancing needs work
It is way too easy in the beggining and gets moderately hard only at the end. I didn't have to use anything but a fully-upgraded pistol (wich actually shoots faster than a Uzi without upgrades, wich is ludicrous) until about wave 15, in wich I upgraded to a magnum then the minigun, completely bypassing the shotgun and uzi. Therefore weapons need some serious balance to make them worthwhile to use (especially nerfing the pistol).
It was quite fun at the end though, since even with a fully-upgraded minigun it was still though to dispatch the hordes.
......
well.......i can't continue. i maxed out the ammo on my uzi and then there is a dot on the radar that keeps following me but the zombie isn't there....
Buggy
Much like what zAzazelz said, except the game broke for me at the end of wave 10. It's a competent shooter, but it isn't like we haven't seen this kind of game before, and it is no different than them, to be honest. It really doesn't help when the game stops loading for some reason. I think it has to do with the game slowing down terribly when killing the heavier zombies... But isn't that something that should be fixed before it is released?