I actually enjoyed the film, especially the ending. Given that we must assume that Calvin escapes into the sea (unless it can fly?)- will there be a sequel?
If so, would Calvin attempt to attack urban human life (and become a boring 'bug-hunt' in high-rise buildings) or find safety somewhere isolated - like the polar caps, becoming a 'Thing' type film?
After watching it, I had the feeling that this could have been a nice prequel to the "Cloverfield" franchise. The funny thing is that "Clover" (the monster from "Cloverfield") looks like an overgrown, now fully earth adapted, version of "Calvin":
https://i.pinimg.com/originals/71/7d/15/717d1543097b5d2c87e22f3a60965531.jpg
https://www.horrorgeeklife.com/wp-content/uploads/2017/07/3-1_Fotor-1-1.jpg
https://2.bp.blogspot.com/-tQZSurGP76Q/WU5jBJbD1bI/AAAAAAAA-30/tmOGMh8od70nXPHs30U1uZEmWRU36mVeACEwYBhgL/s1600/l6.png
https://monsterlegacy.files.wordpress.com/2017/10/calvindfrontu.png
At least it would have been a better pre(se?)quel than "Cloverfield Paradox".