"doom" game legal?

You would have to contact the current IP holder (ZeniMax Media, last I checked) to find out if Moalab has acquired the relevant licenses.

Judging purely based on Moalab's website, and the truly bewildering array of iPhone games/apps they purvey, I'd hazard a guess that it's an unlicensed clone.
[sup][sub](as always, IANAL)[/sub][/sup]

YESS!!!! DOOM!!!!

Ah heh looks so much like FreeDoom and the good ol' Doom level design. Did you guys use Doom Builder or some other Doom level Editor to make the maps?