Deselecting "play musics" still plays music... you need to deselect "play samples" to stop the music. Also, while alt-tab, game do not pause :(

Hi, I've played your game again. I even managed to play some co-op, which was a bit disappointing (expected 'solomode' waves there). Maybe too hard, too. Anyway, I just realized that it's so stupid that we can stick to the border of the screen and enemy might appear there immediately. So, my suggestion is to put sort of frame, that you can't go fully into edge of screen. So you have slight chance to see enemy before it appears or... solution from game "Saviors" some indicators. Cheers....

Add trading cards ! steam needs to start making it mandatory before a game releases on the store

When I run the game ZoneAlarm says its infected.

Mister, please, spanish subtitles in game.