I think theres a glitch where the invincible enemy spawns before it should, but I was able to avoid this happening by staying away from directly south of spawn point.
I thought the dude with things spinning was invincible at first but you've just gotta get him stuck behind a tree and its smooth sailing :)
I came third, good enough!
Great submission for 2 weeks, would love to see what you coulda done in a month with it.