I actually would not mind puzzles of some sort, the timer would need to either be removed or give us longer amount of time.
More save slots is a must, and i guess we shall see in the 50 and above floors but hope enemies are more of a challenge

Also they must have made changes for sure in the update a few days ago?
I got a few upgrades yesterday in floors 1-10, and am now at 28 arm, 30 armour