Infinity Gene's gameplay slowly evolves as stages progress. You'll find yourself up against tougher enemy patterns, bigger ships, and intimidating boss creatures. Your first game may end quicker than you would expect, but any evolutionary upgrades you earn will carry over into your next playthrough.
Difficult stages often become easier depending on which of the unlockable weapons you use. In addition to the default rapid fire cannon, players can choose to equip a homing laser, a wave beam, or a gravity gun, along other weapon types. Eventually, you'll earn the right to increase the number of ships you start the game with. An easier difficulty setting can also be selected, for those in need of some evolutionary assistance.