there are two things that are quite annoying about this game to me: first is that dying does not remove any new portal creatures. the second is that dying in the portal (which happens pretty much instantly once there are more than 3 of the creatures) sends you back to the tutorial. although im not sure if its meant to be the opposite way of dying always sends you back to the tutorial. not a bad game, just a bit frustrating especially the wave where you are obviously meant to use the portal to avoid the boxes lol