The worst thing about the 3D version is the key-pressing reaction time. It's either too slow, reacting a few tenths of a second too late - which means walking through the rooms and battling big enemy hordes takes too much time; or it is too fast so that it counts each key-press double which means winning against monsters is near impossible.
Also the missing step counter and a missing "
undo last step"
function make battling through growing tar a very tedious process, because so many times when the tar grows (which can't be foreseen due to the missing counter) a baby will spawn on a position that will kill you on the next move (because the move before the growth can't be undone).
I also don't recommend that 3D version of TLK.