All the three choices give errors, if you choose Mantis, in the scene where you can answer:
"Your drawings are great too."
"You're so talented!"
"You clearly have a lot of love for your work."
Btw, I love the story :3
I'm glad you like it !! I can't replicate this which means that your browser might have cached an older version of the game (meaning it was a reported issue, but I'm pretty sure it's been fixed now: it breaks along the same lines as the other reported errors that I fixed earlier this morning)? Try a refresh, try restarting the game, or clear cookies (mind you, this deletes Twine saves).