Whole game has such a structure he could easily add like a 999 additional routes and there would still be place for more. There are houses which are unavailable, swimsuit is basically just on a mainscreen, world map has a lot of place and plenty of wasted space here and there. I'd love for more (some fat nerd, grandpa from the store with your sister, some bath scenes with onsen would be amazing) and I hope for it. Still, as far as I understand dev is willing to create some short story from unused material after Tina 2 and begin another game which basic idea is similiar to Kotoka. It's cool cuz Kotoka was pretty good and with how he improved it can be amazing. I still hope he'll go after Summer 2 or DLC to this one cuz it's one of the best h games I've seen.