Starts off fun, but it very quickly becomes repetitive and bland. You're basically invincible so there's zero challenge. The graphics are interesting and unique, but the music and sound effects are generic and become grating. Finally finish the game and my reward is more tedium? Could have at least had a boss battle or end cutscene.
I never thought I'd type these words: I was a cat in an invincible mech shooting down all who got in my way and personally handing out Armageddon, and it was utterly BORING.