this keeps bugging me, but wth is that...thing...in the bottom left corner of the bug display (when you can see wriggle)? honestly, i can't make it out for the life of me what the hell it is... o_o;;
Added Chibitami/Yuki and Mi~ya as artists; both their names are listed in the credits and Cirno is clearly using Chibitami's art style when she says "3+1=⑧?". Directly after that part, Sakuya parodies a meme expression from Death Note and directly after that, Cirno parodies a meme expression from Slam Dunk, so those were added.
Mokou's expression at the beginning also seems to parody this meme expression from MMR (Magazine Mystery Reportage). I don't see a tag for that, so I left that one out :P