Hey, thanks for the feedback!
Did you solve the Orobas's riddle in the basement without going up to the library? If so: that's impressive, if not: then I'd argue did see most of the game. The boss on the 13th floor is designed to be optional, so you haven't really skipped anything that I didn't intend for the player to be able to skip.
It's cool to hear that you still enjoyed the game even if the combat wasn't super your cup of tea.
Noted that you didn't catch the 3HP gear on your first pass. In the current dev build of the game I have that pretty much on the critical path, as I figure that it's too important to be something a player could miss.
It's cool to hear that it worked okay under Proton for you. Eventually I'd like to have an official Linux build, but in the mean time at least that's something I might be able to point people towards.