Koya Rift

Koya Rift is a 2D roguelike shooter-platformer in which you enter a hostile planet and destroy an alien race so the planet can be colonized. Each run begins with you dropped at the surface from a delivery pod sent by a mercenary mothership. You explore procedurally generated caves, earn upgrades and buy units as you progress.

Explore the caves

A minimap shows the area below ground, but not what awaits you. The tunnels and caverns change with every run, as do the enemies and your weapons. Each enemy has a generated size, speed, color, health, damage and weapon behavior, and you must adapt to the weapons available to you.

Your goal is to destroy all the Phantom Crystals, where enemy soldiers are grown. The Phantoms hunt you as their crystals grow and evolve; destroying every crystal wins the level.

Adaptive difficulty

The game adjusts its difficulty based on how you do: winning makes it harder next time, while losing makes it easier. Difficulty is measured on a scale that can expand almost indefinitely in either direction, rather than using a simple easy-to-hard setting or changing only your health.

Adjustments can affect many parts of the game, including Phantom reaction speed and crystal growth, ally costs and leveling, energy-weapon accuracy, size, fire rate and density, health recovery, special-weapon effects, level size, enemy health and damage, ally speed and fragility, cash for defeating opponents, and the speed and force of enemy raids. These values shift subtly, so the source of a change in difficulty may not be immediately apparent.