This is excellent.
Every element of Herald of Havoc is distilled down to raw blasting fun. The weapon set is fantastic, with some strange ones, and some very overpowered ones, tying in fantastically with the enemy roster and level design. Each level has you starting out with only the (incredibly satisfying) Rune Blade and pistol, and each is designed around its own level progression, gimmicks, puzzles and secrets. You'll have some which are fairly standard run and shotgun with weaker guards and a few tougher roadblocks, and then others where you'll be cutting through whole armies with akimbo chainguns. Others still will have you powerfisting ninja assassins, sneaking through military bases with only a silenced weapon, or using the powers of necromancy to summon an army of your own. All this is capped off with satisfying final battle. There's no chaff here, its all heavy hitters. A real gem.