addicting but a bit problematic. first, at one point none of my attacks pierced until i reset my skills and went to the next level. second. the "fake achievement" achievement appears about three or four times per match and altho it was funny at first is really annoying after the hundredth time it happens. finnaly at day 22 during the second wave the enemies just stopped coming. prior to that the game started skipping very heavily. my computer has serious problems so that bug might just be me but for the others, you should fix that up