Worst. Lag. Ever.
Basically every weapon I used except the handgun was bugged.
Killing 2 enemies with one grenade launcher only counted as one kill, forbidding me finishing the level.
Using the shotgun creates the worst lag ever, freezing the mouse or making it move randomly. And no, my PC is not that old, that's firfox, and I was on minimum graphics.
These glitches taken apart, using clay art is a very good concept even if I just can't stand the "Madness" concept, but it's not this game, it's just Madness day in general.
2.5 stars because of glitches and bugs, that forbade me testing the full game.