Survival mode feels like it goes SO DAMN SLOWLY! But, it was quite enjoyable! You can download the demo and try out Survival Mode yourself on the Greenlight version of Night Blights 
Try to beat my leaderboard score
Link to the Greenlight page: http://steamcommunity.com/sharedfiles/filedetails/?id=530876211
Try to beat my leaderboard score Link to the Greenlight page: http://steamcommunity.com/sharedfiles/filedetails/?id=530876211