Calcium Contract is a fast-paced first-person shooter where you're on a mission to finish a contract that got out of hand. Learn to swiftly move around your enemies and master your arsenal as you fight your way toward the grand finale. Includes a unique score-attack mode in ever-changing arenas.
You control a member of the Calcium Order, tasked with eliminating a rogue serpentine creature that has taken control of an island. To accomplish this, you must fight through over 20 levels, climbing the island's mountain and reaching the creature's lair.
The game starts you off with only a scythe, and you must find and utilize the various weapons of the Calcium Order throughout the levels. These include familiar FPS archetypes like a rifle and shotgun, but with some unusual and otherworldly properties. The "Triple Flintlock" has bullets that ricochet, while the "Bone Launcher" fires projectiles that split into more bones upon hitting an enemy. This forces you to experiment and master each weapon's unique characteristics.
If you die, you can rewind time to a previous point, rather than reloading a save or respawning at a checkpoint. This allows for a more streamlined, fast-paced experience, as you can quickly retry challenging encounters without interrupting the flow of gameplay.
The game features a diverse and creative cast of enemies, including gun-wielding cats, kamikaze chicken men, and teleporting jesters. These enemies often exhibit unique behaviors, such as the ability to manipulate or summon other enemies, which requires you to carefully observe and adapt your tactics.
In addition to the main campaign, the game includes a unique score-attack mode called "Eternal Harvest". This mode features procedurally generated levels that rebuild themselves as you progress, adding an element of unpredictability and replayability. You must navigate these ever-changing levels, intentionally seeking out "Eternal Harvest curses" that increase your score but make the game harder in various ways.