Ba Quartet X

Ba Quartet X (バカルテットX) is a fan-made Touhou Project Mega Man X series-like action-platformer game, featuring the bakartet: Cirno, Mystia Lorelei, Wriggle Nightbug, and Rumia. It was created by Penpenmushi no Koucha Beat stages stylishly like idiots, using charge shot, slashing attack, wall jump and air dash! And then, when you have defeated eight boss characters...?