Thanks for giving your thoughts about the game! I'm glad you enjoyed it in the end. ^-^
If you check my blog/Patreon, there's a roadmap some ways back, but I'll give the quick version. Chapter 5 is the last full chapter of the game, but there will be an epilogue, final challenges, and a postgame. When I've done everything I intended with TLS, it will reach its ending, and that ending will be definitive. I might do other projects in this world, but no true sequel.
Good luck with your octogenarian neighbor. =P