Pillarboxed

In Mark of the Ninja, you'll know what it is to truly be a ninja. You must be silent, agile and clever to outwit your opponents in a world of gorgeous scenery and flowing animation. Marked with cursed tattoos giving you heightened senses, every situation presents you with options.
(source: steam store page)

A recent port of an old and popular PS3 game. First PC port from the developer Double Eleven.

Little Inferno is a 2012 puzzle video game developed by independent game developer Tomorrow Corporation.

Thomas Was Alone, and then, Well, he wasn't. Thomas Was Alone is an indie minimalist 2D platformer about friendship and jumping and floating and anti-gravity. Guide a group of rectangles through a series of obstacles, using their different skills together to get to the end of each environment. Listen to awesome music by David Housden.

Descend a seemingly-endless tower, wielding an arsenal of deadly ninja weapons and attacks, as the fearsome Crimson Ninja. This 2D action-platformer uses ninja magic to generate every tower randomly, so no two adventures are the same! Based on the hit Flash game from developers Megadev and Adult Swim Games.

LSL: Reloaded is the HD remake of the classic Sierra "point and click" adventure. I am a Kickstarter backer, and this is based on the Alpha.

Hotline Miami is a 2D top-down action video game by Dennaton Games, a team composed of Jonatan Söderström and Dennis Wedin, who had previously collaborated on Keyboard Drumset *** Werewolf. The game is being published by Devolver Digital and was released on 23 October 2012 for Windows. The game has been described by Eurogamer as a "top down ***'em up", blending top down perspective with stealth, extreme violence and surreal storytelling, along with a soundtrack and visuals influenced by 1980s culture.