Psyvariar Delta combines both of the original versions of Psyvariar with new content, featuring the game's trademark systems: buzzing and rolling. Buzzing rewards the player for grazing the edge of bullets, encouraging risky styles of play. When the player's ship ranks up, it also gets a special effect, such as temporary invincibility.
The gameplay is fast-paced and action-packed, with players able to mix and match elements from different versions of the game. The main game mode allows players to select between various ships and game modes, each with their own unique abilities and playstyles. Players can also choose from multiple soundtracks, including a brand-new Psyvariar Delta soundtrack.
The game features a branching level system, where players are given alternate options after each level, leading to many possible routes through the game. Higher-difficulty levels are only accessible if the player has reached a particular rank, so the game becomes longer as the player becomes more skilled.
Psyvariar Delta includes various game modes, such as traditional arcade mode, practice mode, and replay mode. Players can try any stage with a specified number of lives, bombs, and experience in practice mode, while replay mode lets them watch replays of their previous games.