Dvader said:

But I don't want serious Sam lol

GG Doom still has good level design. Yeah some levels are way more spread out but there are plenty of nooks and crannies with secrets to make it feel fun. The large flat levels serve to put loads of enemies on screen which is where the serious Sam comparisons come in.

I've played it for a couple hours so far tonight. It has Quake, Painkiller and Serious Sam DNA  for sure. It's a LOT of fun. Finally, 90s PC FPS' return!