OpenTTD - An open-source clone of the classic game ...
Mega Man Revolution - A fan-made 8-bit-style Megaman side scrolling shooter game.
Game Dev Tycoon - Game Dev Tycoon is an addictive, Strategy, Business Simulation, and Single-player video game developed and published by Greenheart Games.
Megaman Origins - Between MM3 and MM4 there was a MM adventure, never told, until now:
The Paradise Cove - The Paradise Cove is playable, Action-Adventure, Casual, Building, Management, Massively Multiplayer Online, and RTS Simulation created and published by Pocket Games.
Dead Cells - Castlevania-inspired, action platformer with roguelike elements.