Is it a sign that the last one is going to continue?,
perhaps at the moment, the chapter is the fifth, but it has 1 part, does this mean that there will be a sequel, and I was also hooked by Sam's mother's phrase that even after reaching the maximum size we will still get bigger, does this phrase mean something?
I never said that version 0.5.0 will be the last one. The game main story will end at version ~1.0.0, and the complete end of the whole game is scheduled for version ~2.0.0 plus dlc, you can read about it here (https://boosty.to/hvostt/posts/96778723-4c0a-4b39-af9e-e92f98d77175?share=post_l...).
As for Mama Sam, she will be bigger and the storyline will explain it all and you will get answers to those questions later on.
