Slayin is an arcade game where you control a small warrior facing an endless horde of monsters in a confined setting. The gameplay is unique as your hero consistently moves with a sword extended, defeating any enemy on contact. To survive, you must swiftly navigate, turn, and jump to eliminate foes approaching from all directions.

Leveling up by defeating enemies rewards you with money to purchase upgrades like longswords, armor for reduced damage, and health-restoring roast chickens. Progression introduces new enemies and challenging bosses like the minotaur and devil. Slayin may seem simple at first glance but offers addictive gameplay and hidden content, including unlocking new characters like the thief.