After years of wars and strife, the Earth is on the verge of collapsing. Before it completely breaks down, however, a mysteryous race of [[MechanicalLifeforms robotic beings]] descends from the sky and manages to save mankind. They then retreat in [[OminousFloatingCastle a floating fortress]], never to be seen again.
Until about 100 years later, when an [[NoNameGiven unnamed female Mechanian]] falls down on Earth. With the help of another metal-clad robot she meets down there, she starts searching for a way to make it back to her home.

'''''Celestial Mechanica''''' is a short [[PlatformGame platform game]] with [[PuzzlePlatformer some puzzle]] and {{Metroidvania}} features thrown in for good measures. It was created by Roger Hicks and Paul Veer, and can be bought on [[http://www.desura.com/games/celestial-mechanica/page/2#comments Desura]]; it has since been made freeware and can be downloaded [[http://www.celestialmechanica.com/ here]].

!''This game provides examples of''

* AbsurdlySpaciousSewer: The Water Shrine is basically this. It even comes with his stock [[ControlRoomPuzzle switch puzzle]].
* AndTheAdventureContinues: Once you've defeated the [[BigBad Big Bad]], the characters [[spoiler: go back to Earth and start helping humans again]].
* ApocalypseHow: Technically [[AvertedTrope stopped]] by the Mechanians, but you really have to wonder why there are so many dangerous ruins on Earth or why you don't see any any human being (with the exception of the [[CreatorCameo authors]]).
* Backtracking: For such a short game, the amount of this is pretty high. You'll see the Forest Shrine 3 or 4 times minimum.
* BigBad: The king of Mechanica.
* BlockPuzzle: A few of them, and you need a [[YouHaveResearchedBreathing specific ability to push blocks]].
* CollisionDamage: Touching pretty much anything damages you. [[SuperDrowningSkills Water ]], [[SpikesOfDoom spikes]], electricity and lava kill you instantly.
* CreatorCameo: You can find both creators in the game. They're mostly there to encourage you to buy the soundtrack.
* DeathIsASlapOnTheWrist: If you die you just respawn at the start of the current screen.
* DeflectorShield: One of the power-ups allows you to create a shield for a few instants. It reflects any kind of bullet, but requires good timing to be effective.
* Determinator: Both Mechanian protagonists may arguably count.
* EquipmentBasedProgression: Certain power-ups are necessary to progress through the various areas. This is combined with {{Metroidvania}}-style exploration, as you often have to go back to old areas to open up or access new ones.
* FlipScreenScrolling
* GameBreakingBug: It's perfectly possible to get stuck into a wall or a crate when changing screen. Worse, since the game [[AutoSave automatically overwrites your only save]] every time you enter a new room, this will inevitably [[UnwinnableByMistake force you to start a new game]].
* GuideDangIt: Wait, you mean I can get that floating power-up late in the game?
* HalfHumanHybrid: [[spoiler: The protagonist. In fact, this is the exact reason the king banished her from Mechanica]].
* HeroicMime: Your main character.
* HeroicSacrifice: [[SubvertedTrope Subverted.]] [[spoiler: Your companion remains behind to stop the guards from chasing you. He's outnumbered and defeated, but they just capture him and he gets freed at the end of the game]].
* HomingProjectile: One of the main types of enemy you'll find shoots homing missiles. You can catch them, [[TheComputerIsACheatingBastard but if you throw them they just fly in a straight line]].
* InformedAttribute: There's really no way of telling which genders the characters are, other than official or in-story information.
* LethalLavaLand: The Fire Shrine.
* MooksButNoBosses: There's only a single boss battle, against the [[BigBad King]], and he behaves pretty much like any other mob. However, he has much more health and [[TurnsRed becomes much faster as you hurt him]].
* NoNameGiven: All the characters go unnamed. The Mechanian protagonist's name is later revealed to be [[spoiler: Marina]].
* JumpPhysics
** DoubleJump: The first power up you get lets you do this.
** NotQuiteFlight: Another power up gives you the ability to hover, increasing the distance you can traverse jumping.
** WallJump: Another power up.
* KingIncognito: [[spoiler: Your grey Mechanian friend? He's the prince of the fortress, and he's trying to start a rebellion]].
* OminousFloatingCastle: The fortress of Mechanica.
* RegeneratingHealth: Getting hit once make your character [[FlashOfPain flash red]]. If you get hit again while in this state, you lose. About five seconds are enough to recover.
* RespawningEnemies: If you die or change screen, expect every single enemy (including the turrets) to reappear.
* {{Retraux}}
* RidiculouslyHumanRobots: The Mechanians, of course. They even age and grow, apparently. May overlap with [[OrganicTechnology Organic Technlogy]], as this is the only possible explanation as to how can Mechanian reproduce, and most specifically [[spoiler: reproduce with humans]].
* TheReveal: A couple of plot twists are revealed at climatic points. Namely [[spoiler: your ally is the prince and your character is [[HalfHumanHybrid half-human]]]].
* RunDontWalk: And ''how''. The player character is so fast you'll often crash right into obstacles before you manage to stop her.
* SoundtrackDissonance: That relaxing song that plays during the intro is heard again during the final fight.
* TeleportSpam: The King can do this if you get too far from him, but there's no point in doing so. Also, he has no way to reach or hit you if you climb the small floating cage on the right.
* TennisBoss: The first and only boss fight is this. You have to catch the fireballs the King throws at you and then shoot them back at him.
* YouShallNotPass: Your companion pulls this to stop the royal guards from catching the main character.