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.

There's some many enemies it looks like a chore to get through. I've already hit a wall in Doom Eternal where I'm not bothered doing a section if it's too repetitive with too many enemies.