HA, you got the bug-slime, it is so hilarious to watch and I would really like to know why that happens (I got it just by walking in some precise placements, it is not spamming), I got it a lot of times when I was grinding for Iron Man mode.
Also I agree with all of your points, though cheating boss 2 isn't that hard, it just requires getting down to 1 Hp and surviving.