GG Aleste follows the story of Ellinor Waisen, daughter of Ray Waisen, the original pilot. Your mission is to eliminate enemies level by level with your space ship. The gameplay involves exterminating foes and collecting power-ups to upgrade your weapons.
The gameplay revolves around upgrading both primary and secondary weapons. Power-up pods release P capsules for primary upgrades, while flying pods provide secondary weapon upgrades. You start with a laser as your secondary weapon, which can be replaced with various power-ups, including split fire and napalm rockets. Both primary and secondary weapons are used simultaneously by pressing button 2.