(still not quite as good as those two... I had the ideas for those the day before starting work on them... Wumpus has been brewing for over two years, I think.)
... people can just make a TIO link with the whole interpreter, like how I did with Unbalanced. For most minimal esoteric languages that's fine, and it works even for Jelly.
Nope, didn't dive too deep yet. I've read the part about the structure of the program, but currently I'm implementing some flags for Triangularity, so reading the whole description might take a while.
I generally use the esolangs room: chat.stackexchange.com/rooms/27364/… (except for my two bigger languages, Retina and Alice, those have dedicated rooms)