Some upcoming indie games you might not have heard of

Absolver
Souls-style combat except everyone is Jackie Chan. In Absolver, from Sloclap, players roam the lands of a fallen empire and fight one another or team up in mentorships as they choose. You can create your own stances and your own fighting style from the game's "deck" of attacks, and can switch between four of them mid-combat. Essentially, you get a player-driven story with tons of user customizability and some really awesome looking brawls.
https://www.youtube.com/watch?v=oX9dPFlEvnc

Manifold Garden
A game currently being made by William Chyr, Manifold Garden is a puzzle game where you navigate a world full of impossible architecture by switching around gravity to walk on and fall along all axes. If that isn't nauseating enough for you, each level tessellates on itself infinitely, as you can see above. Basically, imagine trying to do a level from Portal, except if you fall downwards out of the level you loop back to the top of it. And also there's moving block puzzles, worlds within worlds, recursive portals, and other witchcraft. It's hard to explain. Go watch an E3 demo if you want to try and wrap your head around it.
Gameplay- https://www.youtube.com/watch?v=Z5II-uyYmHQ
Cinematic- https://www.youtube.com/watch?v=jqBvOdUrB-M

Frozen Synapse 2
The sequel to the amazing and unforgiving Frozen Synapse from Mode 7 is on the way. In FS2, players control a squad of units and plan out five second turns for them to take, telling them to the letter where to walk, duck, aim, ect. However, you have the ability to 'test' a turn, and give test moves to the enemy team in order to simulate as many scenarios as you like. Turns are planned asynchronously, and once both players commit, executed simultaneously. Coming out on top requires out-thinking and out-guessing your opponent as you aim to counter every possible plan they could throw at you all at once. FS2 will also feature a single-player mode where you compete with several AI factions for control of a city by fortifying your base, sending out your squads on the street to take over new buildings, buying new units to add to your free-form army, building alliances, and lots of other stuff. Randomly generated levels, destructible terrain, no luck-based stuff, cyberpunk minimalism, and a gorgeous soundtrack. And no elevator level this time.
Slightly outdated but informational trailer- https://www.youtube.com/watch?v=01ZnHgvSpK8

Visage
You can't tell from this fairly potato gif, but people say that Visage looks like Allison Road (cancelled) which looked like P.T. (same) which was supposed to be a new Silent Hill. I don't know what that means, but I've been told it's a good thing. Coming from Sadsquare Studio, Visage is a psychological horror game where you explore a crazy realistic house (take a peek at the trailers) where a lot of people from a family have died. Except something is terribly, terribly wrong. The game's focus is on long, stressful buildups and sound design rather than jumpscares, but it will be packing a few of those. If you're into horror, check out the kickstarter alpha trailer. This is going to be something special.
https://www.youtube.com/watch?v=bMlTSukHsX0

Due Process
After a long trip through development hell, Giant Enemy Crab seems to have gotten things together. Due Process is a team-based breach-and-clear that brings to mind Rainbow Six and CS. Cops have to bust into the crims' building, using riot shields and flashbangs and wall charges and old-fashioned door kicking to get in and kill everything, while crims have to fend them off with mostly surprise and strategy. Unlike other FPSes, however, maps are randomly generated. Each team is given a minute to plan and draw on the map from an overhead view and decide how they want to either attack or defend a building that they've never seen before. Games are quick paced, action packed, good old retro fun. There's a lot of gameplay footage from the super alpha stage before the art style was developed, if you want to see it in action. Just be warned that by super alpha I mean literally all placeholder graphics.
"Alpha as fuck"- https://www.youtube.com/watch?v=U2Wu0hOSOyA