I hate to be posting such a generic comment (I really like the game so far, I just lose often so I haven't progressed much and can say anything substantial) but...
How do you save files?
Escape key brings up the pause menu, there’s an option to save or load files from that menu! There’s also a handy auto save slot you can load if you forgot to save for a while ^^
Thanks a lot! Finally met Lilith! :D The story keeps getting interesting!