As you get into higher dimensions, you get exponentially more space, which makes getting to 2048 easier and easier (3x3x3 3D suffers from this, somewhat). So 5D would probably need to bump the winning score up to 4096 or even higher, but then the game start taking far too long.
Yes, but the smallest interesting 5d one is 2x2x2x2x2, i.e. 32 squares, which is much more flexible than the 16 squares of the original (and of this one).
