Exerion

Exerion is a vertical shoot 'em up where you pilot a ship through alien-infested zones, blasting hostiles while managing two weapon types. You've got fast single shots with limited ammo or slow double shots you can fire endlessly—pick wrong and you're toast. The game uses parallax scrolling to create depth as backgrounds move at different speeds, and your ship handles with inertia physics instead of stopping on a dime. Both were unusual touches in 1983. Expect pattern recognition and resource management as you decide when to burn through your better gun. The scenarios shift visually as you progress, though enemy waves remain the primary challenge. If you like old-school arcade shooters with a mechanical wrinkle, this delivers.