Most of this patch comes from one very good bug report by Abide. Thank you.
Your gold upgrades stay bought
Levelling up rebuilt your max health from scratch and threw away every health upgrade you'd paid for. Quitting to the menu mid-run dropped your vendor damage and attack-speed buffs too. Both fixed — run buffs and bought health are saved with your character and restored when you return.
Joining a friend no longer resets you to level 1
Characters were being read from the host's machine instead of yours. Your character, bank and house now travel with you into someone else's game.
Guardian Angel stops eating gold
It caps at 25. The vendor now refuses the sale once you're there instead of taking your money for nothing.
No more duplicate legendaries
Drops skip anything you're already carrying.
Depth 20 is a fight, not a sponge
Monster health grew by the same multiplier forever — by depth 20 everything had 598× its base health and the run turned into chip damage. The curve now bends at depth 10: the depth-20 multiplier drops to 64×, and boss health goes from 10× to 7×.
Monster damage is deliberately untouched. The deep floors should still kill you quickly — they just shouldn't bore you first.
Typing in chat no longer fires shortcuts
J, E, I and T in the chat box opened the journal, inventory and the rest instead of typing the letter.
The in-game feedback option comes straight to me and I read every one. Keep them coming.