I liked the demo very much, top quality, and as a tip
1. i must digress that if you guys are not going to make it in a way that the player can conquest all of them (see all the content) in a single playthrough, (not talking about an harem ending here), then add a "new game+" so that the player can more easily get to the parts that he didn't see;
2. Please don't make missable time based events or i will abuse the save file and be careful about events that overcome one another, i saw bugs in other games that had this kind of thing;
3.Just from inspecting things it costs energy, and i don't really understand why you would want energy in the game unless you want the player to take it slow and don't do everything there is to do in one single day.
I wish you guys luck and good job!