I have completed the game and crowned myself King - I definitely missed some secrets though, as I never found the sword or blue gem staff. Has anybody found all the secrets?

First off, this game looks straight up like Heretic. Loved that game, but it didn't age well, so seeing this game leaves me excited. The problem is, the requirements state Win7 as both the min and recommend. Does this work with Win10? If not, is that and/or Linux planned? I eagerly await a response....

Any chance of adding a FOV slider? At the moment the FOV is way too narrow when playing fullscreen (1920x1080).

Where is the game progress stored?

How do you save the progress in the game? Am I this much of a noob, or am I missing something?