Plot: Knytt Underground is a 2D adventure game in the exploration subgenre similar to Metroidvania games, with elements of arcade platformers, combining the mechanics of the developer's previous games, Knytt and Within a Deep Forest. Wikipedia
Plot: Eternal Daughter is a freeware 2D action-adventure game created by indie developers Derek Yu and Jon Perry and released on June 21, 2002, under the Blackeye Software label. Wikipedia
Plot: Iji is a freeware 2008 video game featuring platform and shooting elements, developed by Daniel Remar using Game Maker over a period of four years. Wikipedia
Plot: Hero Core is a freeware shooter game created by Daniel Remar, the developer of Iji. The game was released on 3 May 2010. It was created in Game Maker Studio, with music composed by Brother Android. It is a sequel to the game Hero. Around 2013 the source code of the game was made available to the public...
Plot: Cave Story is a 2004 Metroidvania platform-adventure game for Microsoft Windows. It was developed over five years by Japanese developer Daisuke Pixel Amaya in his free time. Cave Story features 2D platform mechanics and is reminiscent of the games Amaya played in his youth, such as Metroid and Castlevania...
Plot: Digital: A Love Story is an indie visual novel by video game designer Christine Love, released for free in February 2010. The game's story is linear, with the player's actions unable to significantly change the course of the plot. Wikipedia
Plot: Axiom Verge is a Metroidvania video game by American indie developer Thomas Happ. The game was originally released in March 2015 in North America and April 2015 in Europe and Australia for PlayStation 4. It was released in May 2015 for Microsoft Windows, OS X, and Linux. Wikipedia
Plot: Crayon Physics Deluxe is a puzzle video game designed by Petri Purho and released on January 7, 2009. An early version, titled Crayon Physics, was released for Android from 2006-2007 developed by Acrodea Korea, Inc. Deluxe won the grand prize at the Independent Games Festival in 2008. Wikipedia
Plot: VVVVVV is a 2010 puzzle-platform video game created by Terry Cavanagh. In the game, the player controls Captain Viridian, who must rescue their spacecrew after a teleporter malfunction caused them to be separated in Dimension VVVVVV. Wikipedia
Plot: Shadow Complex is a platform-adventure video game developed by Chair Entertainment in association with Epic Games and published by Microsoft Game Studios for the Xbox 360 in 2009. The game follows Jason and his girlfriend Claire, out to explore some caverns. Wikipedia
Plot: Aquaria is a side-scrolling action-adventure game designed by Alec Holowka and Derek Yu, who published the game in 2007 as the independent game company Bit Blot. The game follows Naija, an aquatic humanoid woman, as she explores the underwater world of Aquaria. Wikipedia
Plot: Crayon Physics Deluxe is a puzzle video game designed by Petri Purho and released on January 7, 2009. An early version, titled Crayon Physics, was released for Android from 2006-2007 developed by Acrodea Korea, Inc. Deluxe won the grand prize at the Independent Games Festival in 2008. Wikipedia