Meritous

Meritous is an independently-made PC game, a cross between a top-view dungeon crawler and a bullet-hell shoot-em-up. In it, you control main character Merit, who travels through an enormous 3000-room labyrinth, the Orcus Dome, in order to find three artifacts called the PSI Keys, and restore them to their proper locations.

Although enemies fire copious amounts of bullets at you, you don't shoot back- instead, you have an attack called a PSI Circuit, which you charge up to unleash a shockwave