Pretty cool game!
But I restarted wave 3 three times, there's always a phantom dude spawned at col 4 row 2 of the grid.
But at least he doesn't seem to get infected.
Thanks for bringing these two issues to my attention. I had not noticed this and I'll be looking into it.
Perhaps the issue with that spawned character has something to do with the restart functionality being broken.
Edit: Bug has been fixed. It did indeed have to do with pausing and then restarting the game while characters were in the middle of changing positions on the grid—the characters seemed to get stuck.