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As a PS2 game ported to the PC, this budget title from 2008 looks and feels pretty dated, but it is natively Hor+ nonetheless.

An MMORPG (massively multi-player online RPG), set in ancient China.

Armed with an alien nursery-worth of zombie-zapping plants like peashooters and cherry bombs, you'll need to think fast and plant faster to stop dozens of types of zombies dead in their tracks.

RollerCoaster Tycoon is a simulation strategy computer game that features theme park management. Developed by MicroProse and Chris Sawyer and published by Hasbro Interactive, the game was released for Microsoft Windows on March 31, 1999 in North America and in Europe on April 12, 1999. Later that year, an expansion pack titled Corkscrew Follies (Added Attractions in Europe) was released. In 2000, a second expansion pack was released titled Loopy Landscapes.

Commandos 2: Men of Courage is a 2001 real time strategy game by Eidos

Velvet Assassin is a stealth game from Replay Studios published through Southpeak Games set in World War 2. You play a female assassin/spy who performs stealth missions behind enemy lines during the war. The game is very much like Thief and Splinter Cell, with only a special "morphine mode" to distinguish it, allowing you special moves and limited invisibility. Despite not being a big budget game, Velvet Assassin offers rare hardcore stealth gameplay in a unique setting for the genre with nice graphics and good controls.

The Maw is an action-adventure video game developed by independent developer Twisted Pixel Games. It was released on Xbox Live Arcade on January 21, 2009, and for Microsoft Windows on March 9, 2009. It became available via Steam on March 10, 2009. The game revolves around a blue alien by the name of Frank, and a purple blob named Maw, that he leads around the game world, feeding and evolving.

The game won the 2008 Audience Choice award at PAX10, and is currently a finalist at the Independent Games Festival 2009.

Battlefield 2142 is a 2006 first-person shooter video game developed by DICE and published by Electronic Arts. It is the fourth game in the Battlefield series. Battlefield 2142 is set in 2142, depicting a war known as "The Cold War of the 22nd Century", in which two military superpowers – the European Union (EU) and Pan Asian Coalition (PAC) – battle for the remaining unfrozen land during a new ice age.

Source: Wikipedia

In Flock! you control a flying saucer and must drive scared animals to your mothership through obstacles and traps. The game also features a proper campaign for 2-player co-op and a map editor.
Like in Switchball and a couple other "cross-platform" titles, the framerate is capped to 30 fps.