the water cooler need to improve the buff, 1 water cooler it recovers like 15%/20% max HP, is a lot of water that our hero is drinking, it should recover more HP I think like 30/40% is much fine and there's another water cooler that doesn't recover HP, just remove a debuff, same, our hero is drinking a lot of water, it should remove 2/3 debuff at least, not only 1, is to unfair.
there buff options that are: 400% more probabilities to found an epic or rare rooms, I think its bugged, i have scaled many rooms, like 20 or 40 in a row, and I don't get a rare room, epic is working more or less, but rare rooms definitely not
5 status effects I think is more balanced than only 4, having only 4 it's not fair or challenging for normal mode (free)
well all these inconveniences I found on the villain lair, some people on my team say that having problems in this mini-game, so I hope that, can send all my feedbacks and suggestions to the game administrators to improve villain lair and fix all problems and bugs.