I really enjoyed this game and I agree with a lot of the users who say it sucks that you don't have a jump button. Although I must say, it does make it more challenging and forces you to get good at the game. The weapons are extreemly useful all the way down to the pistol and I really like how the guns can kill zombies offscreen. As for the glitches, I haven't really encountered that many of the glitches that everyone seems to be talking about, which is fortunate for me. But even with these glitches, I can see myself enjoying the game. The music was nothing spectacular, but maybe that's why it helped it blend into the gameplay. I must say, the main menu music reminded me of COD Zombie mode. The art style was also need, it kind of reminded me of "Portal Defenders" here on NG.
Overall, a very enjoyable game, hopefully we get a sequal someday!