Ah, I made "steam", but didn't "get" that I could (and had) to put in water/fire in the "pre-occupied" fields as well.
Hi !Thanks for giving my jam entry a try!
I've just added an update that maybe fixed this issue (for potential future players) where the alone slots now have a new recipe. Pond must be filled by water, breeze by wind etc. Anyway, have a nice day ^-^