Uhmmmmmm, I hate to break this to you my dude, but you press the esc button or right click on you mouse to bring up the pause menu. From there it should be easy to see the save and load options.....
don't worry that's fine, but I think you misunderstood me a bit.
it's not about how to save a game, it's about the fact that it would be more convenient like other visual novels do that there is a save folder where you can save the game files and copy them out when a new version of the game comes out so you don't always have to start a new game.
because earlier this was still possible in the very first older versions but at some point it was taken out.
OHHHHHHHHHHHH. lol
I don't tend to that, because those saves are more likely to crash and i tend to save a lot in an unorganized fashion. It ends up being more of a pain to keep them than to start fresh. :P
There is a save folder in this game, its just a bit more complicated to get to, but if you go to the options menu and click on User Data you should be able to find it.