A hilarious game by Planet Moon Studios, the same people who made Giants: Citizen Kabuto, who in turn were the same people who made MDK while working at Shiny Entertainment. Featuring a cast of misfits battling though a living parody of Britishness to pull off the ultimate heist and maybe while they're at it, save the world. Your group consists of the smelly, blind seer Rexus, a tea drinking robot named Q, as well as Jonesy, a moleman with a little too much interest in explosives. Your role is the protagonist, Roman, who may or may not have really bad teeth.
This game provides examples of:
Abnormal Ammo: LAND SHARK GUN. I don't know how else I could explain this, here.
Anachronism Stew: You're wielding a machine gun and fighting people with bows and arrows. There are zeppelins and fixed artillery, but no land-vehicles. Sentient or Semi-sentient robots for farming and fighting use conventional weapons. Your jetpack enables you to fly over pre-industrial style blast-furnaces. Armies try to overcome you in a siege by putting ladders up against your wall while you fire mortars at them.
Dumb Is Good: Quite literally. A curse on the royal line of Forge makes every generation alternate between Evil Genius and good-hearted Ditz. The current king Forge is evil, his son Stig is a good-natured idiot: King Forge wants the book of rule partially to undo this sad state of affairs.
Gameplay and Story Segregation: The cutscenes and the levels often have only a tangential relationship to each other. In a more direct sense of the trope, you'll notice that Roman never has the jetpack in cutscenes that you can pick up in the game.
Gravity Screw: A corkscrew that can reverse gravity is just one of the crazy weapons this game has to offer.
Quite literally, in fact. The Topsy-Turvy Bomb, as it's called, is an anti-gravity device mounted on a big corkscrew with handles. Anti-gravity cars were in development with these, but when activated, they would just lift off into space. The Empire decided this would make a good weapon, and thus, by latching onto the ground and activating, the bomb quite literally reverses gravity for anything touching the ground in a large field of effect for long enough to kill them from Falling Damage. Thankfully, your squadmates don't have to worry about this, for some...reason.
Healing Checkpoint: The pubs serve double duty as save points and health/ammo restore points.
Improbable Weapon User: A shark gun, miniature black holes and magnets combined with boxing gloves, and don't forget the Corkscrew Bomb as explained in the Gravity Screw entry.
Jedi Mind Trick: parodied by Rexus- he tries this on the troops of Forge who invade his home to capture him. He only succeeds in retrieving a table. Later on, he tries it again on a different set of troops and succeeds, convincing the soldiers they are, in fact, French.
Spiritual Successor: To MDK, another comedic shooter from the same creators, with virtually the exact same sort of interface, gameplay and style of humor. It even includes a shout-out to the original, with the World's Smallest Black Hole taking its name from MDK's World's Smallest Nuclear Explosion.
Spot of Tea: Q was made sentient in an experiment with tea, leaving him obsessed with the stuff.
If you're running low on health and wait in a quiet spot for a while, Q will sometimes dispense a cup of "healthy tea" which restores a significant amount of your health bar.
Video Game Cruelty Punishment: Destroying the homes of hapless villagers will often trigger a comment from your comrades and a reduction from your final score. Assuming you care about your score, that is.
We Cannot Go On Without You: If either Jonsey or Q have their life bars depleted, then they are simply unavailable for the rest of the level. If Roman goes down, however, then it's game over. On one of the extra missions, you need to keep both of them alive (but can order them to wait where they are.)
Your Mom: The random extra was actually being serious. In fact, he was sleeping with Jonesy's Mom.