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Based on my PICO-8 game, Bullet Sheep, this is an endless horizontal-scrolling bullet hell shoot'em'up game.
It has a quite different scoring system from the original work, more suited to endless play. The woolbombs still function as the scoring mechanics, but instead of giving you extends they increase your score multipler significantly based on the number of bullets cancelled. Also, because it is an endless game, there is a rank system to force player to lose. Shooting, using woolbombs, and even surviving are increasing the rank value, which in turn increases difficulty significantly. The only way to lower the rank is to get hit and lose a life.