Not sure if it's a good idea to have an edible mushroom with the color of an IRL lethal one?

It probably is just the connotation of spicy. When I think of spicy, I think of the color red. Some people might not have the same train of though, but a lot of peppers are red.

But it is a video game, so no harm no foul. I dare say kids would (and should) generally be told what I was growing up: "don't eat anything you find outside." So, at the very least, I don't think it is a problem.