Pretty decent if I say so myself. It's just the setting and power balance are kinda too absurd.
First, power balance, when we see the world as a game, sure the level and grade things sound plausible, but when it's seen as a 'world', these things aren't balanced at all. As if from other POV grade is everything matter, but from MC POV level is everything.
Then about the setting, firstly it's about a man playing a game, then he added mad scientist + modification + killing things, not enough, he turned the game into another world, still not enough, Gods appeared here and there, and finally galactic war is about to begin.
Well, aside from, let me say it again, the tension / suspense is actually quite good here.