I can only fix reproducible bugs... the bank and save export work fine for me. Check your clipboard settings maybe? I can make you a savestring if you tell me where about you're at.
Fullscreen button is a good idea, I'll add it to my list.
The mage tower now requires you to read your journal, to force players to read the journal.
Selling mirrors doesn't make sense; you're buying them from a glazier in town. Selling crystals... I'll consider it. I don't really feel the game needs more ways to generate coins, though.
I'm not sure what you mean by 'gain magic from work'...
Thanks for the feedback!