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It still works almost completely on mobile, except for a few new items. Grabber-ing an item holds it at the handle where your normal cursor/tap is, and if there's anything at the handle (like, say, the bottom row of potions) it selects that instead of what's about two potion slots up. The cake lets you double-stack grabbed items when you first get it, rather than swapping with them on click.

Neat game! Mobile's still buggy (can't load/return to main menu, can grab unspawned items offscreen), but it's more than playable.

The potion crafting itself is a bit clunky; there's at least one point I accidentally mixed a clean potion by clicking after a correctly mixed one. Some amount of crust is typical for the papers-like, though

A "pay 2 win" item you can drag 5 gold into to walk you through a specific adventurer would be funny, at least, and might help with the handful of edge cases people run into. 

Finally dug around enough to find the settings file, and somehow my cursor coordinates were both calibrated to negative five hundred and seventy-one billion (and change). Resetting those to 0 fixed the issue.

Maybe I moved the mouse too much while calibrating?

I think my game's bricked until I reinstall it; the opening screen has the cursor permanently stuck in the top left hand corner, reacting to clicks but not mouse movement.

The only setting I remember changing since it worked was turning off fullscreen so I could check the completed map at the same time.

For anyone who needs help:

The book is unlocked with a key in the window of your room.

Once you've started stirring two different ingredients, you can only stop by finishing the potion (have the bellows pumped while the bar's in the yellow, moving or no), or overflowing it (and getting a side effect).

Two stirs and spamming the bellows is the fastest way to finish potions without much risk of overflowing, and can keep pace with the final day.