Typically a treasure vault is at the end of a level! Cool, a reward for your hard work. But usually they drop a lot of items - vials, capsules, etc. - that will be gone once you leave, and vials seem to be pretty predominant. Takes the feeling of reward out of the reward! I have 2 suggestions,
1. Get rid of those items in a treasure vault.
or
2. Give a player some bonus heat or bonus crowns as part of the level-end roundup, based on whatever's left in the hotkey tab.
I thought this was addressed somehow somewhere on this forum, but I scoured and couldn't find it. Sorry if it's a repeat!
I've been going into some pretty decent Treasure Rooms.
They get better as you go deeper.
I just wish the rewards were as good or better than running a regular level.
Because I miss out on the chance to get possible rare monster drops and massive amounts of heat and crowns when I go inside them, but they still cost 10 energy.
They need to be rarer to generate and at least ten times better than they are right now for them to work properly.