Not every game in this list is trippy. (Though the trippy ones really are trippy.) Only about half of these games are available now, but the others still look promising. Enjoy!
Blink
Windows, Mac, Linux | $TBA | Spring 2015 | Greenlight
From the developer: "Blink is a second-person puzzle platfomer where you view the world of Palinopsia through the eye of a mysterious ancient being. Just close your eyes to see a world where light is frozen in place and is as solid as the ground. Solve puzzles by positioning spotlights, moving lanterns, flipping light switches, and casting shadows to create platforms or openings in the world behind the ancient being's closed eyes. Explore beautiful hand drawn landscapes while uncovering the secrets behind this strange power."
Children of Morta
Windows, Mac, Linux | $TBA | Q3 2015
From the developer: "Children of Morta is a narrative-based roguelike hack'n slash game for PC, Mac and Linux which will involve you in the adventures of a family. Since the corruption of the god of Mount Morta, his rage and anger has turned all the creatures into sick, furious monsters. The Bergson family, guardians of Mount Morta, live in their house at the mountain side. They try to reach the peak of the cursed mountain to find out what happened to its god and how they can change his doomed fate!"
Colorazy
iOS, Android | Free (IAP) | Available now
A simple puzzle game in which the goal is to connect the dots via a line that travels through every square on the board. To create a path for the line to follow, squares must be rotated. If two adjacent squares have the same color on the side where they meet, there will be no wall; if they are different, the way is blocked. Developer Max Marozaw is from Minsk. The game does not seem to have a dedicated web site.
Disorder
Windows, Mac | $TBA | Releases January 13, 2015 on Steam
This puzzle platformer is setting itself up to be psychedelic. Watch the trailer and see for yourself.
Herald
Windows, Mac, Linux | $TBA | Sometime 2015
Herald is a choice-driven adventure game with gameplay inspired by "The Walking Dead and other interactive dramas". It's set in the 19th century and its main character is a man born in East Asia and raised in the west. Now working on a colony ship headed from west to east, he gets to deal with his mixed heritage.
POP: Methodology Experiment One
(Photosensitive epilepsy warning for both trailer and game!)
Windows, Mac | reg. $3.99, $4.99 w/ DLC | Available now
This game is a short but trippy experimental game. It was originally released in 2012, but is now on Steam and there's a DLC available with developer commentary. It was created music first and evolved into a series of minigames connected by strange clips of footage. It's currently 25% off in Steam's holiday sale.
Run or Die
Windows, Mac, Linux | $4.99 | Available now
Here we have a runner with both endless and challenge modes. The level designs look interesting, and the game gives the player five abilities to use to deal with the obstacles it puts in their path.
Skullz
Browser (Non-Unity) | Free | Available now | Skullz 2 IndieGoGo
This is a trippy adventure game, playable for free in the browser and featuring lots of purple. It was originally created as a thesis project for a bachelor's degree and Pizzamakesgames is now trying to raise a humble €500 (approx. $600 US) to make a sequel.
There Was a Caveman
Windows, Linux | €5+ (~$6 USD) | April 2015 | IndieGoGo | Greenlight
This one is retro-styled platformer currently in development. It looks like it will give the player lots of options for how to tackle the obstacles the environment offers, including spears that can be thrown into walls to make getting up walls easier, mid-air dashes, and a club that can send projectiles back from wence they came. They are trying to raise €2,000 (approx. $2,400 USD) on IndieGoGo.
from IndieGames.com http://indiegames.com/2014/12/trailer_roundup_2014_12_29.html