Mega Man Revolution - A fan-made 8-bit-style Megaman side scrolling shooter game.
Megaman Origins - Between MM3 and MM4 there was a MM adventure, never told, until now:
Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
Dead Cells - Castlevania-inspired, action platformer with roguelike elements.
Shovel Knight - Best Game Company Born of a Yacht
Meganoid - Retro-style 2D shooter platformer with randomly generated levels.