Thank you! The only saves are auto-saves at the start of each day, but it saves the last 3 days. If you want to back up your saves, they are the appdata/roaming/forestinn/ folder.
Increase Lucy's desire by getting to know her better, then eventually the flirt option will appear in the evening. Once you've built the Alchemy Bench it should be pretty fast.
The OST is entirely original music, and we should really look at getting it on spotify or something haha. If put it up somewhere, I'll mention it in an update post.