Sorry! Seems I didn't realize there were 2 different enemies in stage 0 as they look almost the same size. Explains why they weren't getting 1 shot. I edited that part out.
Also im not sure about that as im playing on the desktop build. The browerser version is unplayable for me since im on laptop and cant zoom in/out of the skill tree delicately enough with the touchpad to see the upgrade descriptions. I get 1-3 immortals around 1 in 3-4 rounds
I suppose now is a good time to reccommend a zoom in/out slider or buttons for the browser version for people like me.