Ooof make me feel old why don't you... this isn't Doom, it's Dungeon Master! The grid system, everything moving on a metronome, inventory system etc. I agree this version is shallow but very easy to pick up.

Legend Of Grimrock is the modern remake I know, drags you into its complexities level by level. Really good game.

The levels are more Wolfenstein 3D than Doom.

It's neither, more like Dungeon Master or Eye of the Beholder.

You aren't missing much, the game only goes up to level 15 (yes I played the entire thing)

Same for me...