This game is very much in development. There is no intro, and no ability to customize the player character.
It does have tutorials, which should be enough to get you started. But if that's not enough, you can ask questions here. Maybe I'll make a guide for this game too.
About saving, note that you first need to select a save slot, then press "save" word on top of the save slot list.
Last blog post from the developers is on 25th of July, and there were no new monstergirls there. But they do plan to expand base defense gameplay, and add elf girls we can capture.
Feels like it's about time for a new blog post, as they come about once every 2 weeks.