Great game! Totally Addicted :) I have 2 suggestions 1) have an undo button with only 1 time use to undo a move/mistake drop 2) Number the coloured balls, not only for the blind but I find the Pink is hard to tell if it is Purple above the drop line.
A solution to the elevator problem is to add more staff elevators. The Staff tends to make many short trips holding up the existing elevators. But be sure to spread the staff elevators out. As well if you try to put a bank of elevators 4 or more in a row this will not help. You would be better to demolish the middle part of your hotel and add 2 rows of elevators. I have 12 high capacity elevators and 3 staff elevators.
To speed up the game please add a turn off animations button and a skip battle button. If I am fighting a mage or knight I fight them the same way. There is no reason why I have to keep watching the same battle over and over agian.
I like the game but, the games needs to be more difficult. The AI spends too much time casting spells on themselves and not enough time attacking you. At no time during any battle were my characters in danger of dying.
Glitch: when fighting the snowman with the magic charater. I used restore 30% during the battle and died. It restored the charater with 30 % health but neither charater could attack for the blue bar no longer increased.
Level 10: If you don't have enough money to buy Grenade Launcher. You will have to sacrifice one guy in the upper left corner of the screen to get one of the Large monsters to get close enough to the explosive barrel. For there is not enough room for the large monster to get past the barrel.
Tip: if you buy assault rifle you can stab the enemy instead of wasting your ammo.This is very useful on any level where the enemy continues to come out of the sewer grates. You place your guy on the square directly above the grate and select the shield and he will never "waste out" of ammo.
Upgrades - oxygen tanks you can leave in places, options to take the oxygen tank already placed, the ship that takes you out to treasure points could need upgrading to get to those further treasure zones, cost penalties to go to treasure points so you are not just going back and forth to get the next upgrade.