Played through Tethered tutorial last night. I love the game but here's my thoughts on whether it's worth a 10% discount or not.
-It's a resource management game basically. Your guys just appear over time in eggs to ramp up complexity and you have the mine, farm, build, and fight in order to level up a shrine that end the level when maxxed out.
-It's unreal engine and a fixed camera with multiple view points. Because you can't zoom in a ton the game looks gorgeous. Videos do not convey because the fisheye lens and constant camera movement make it look like a budget RTS. It's not AAA level visually but the music is fantastic and as good as most other strategy/resource games.
-It has 13 levels and the tutorial took 30 minutes at a decent pace. I'd wager the game is 15-20 hours with the increasing complexity and size of thee maps. Everything upgrades and many things have multiple upgrade paths.
-VR changes everything. It feels like you're god of these guys and the sense of place over them is amazing. The game is really a proof of concept on a VR control scheme for this type of game. You "tether" the guys to actions to get them to do things. It's works very well though the game doesn't appear to be pushing it's limits. In the tutorial you control around 10 guys at once. I only think you'll manage around 20 by end of game.
The tl:dr is that if you like resource management games (not just Civ) you probably would like it because of how mind blowing the VR aspect is and the general polish and complexity. It's worth 30 bucks for those people but your general CAGer should wait for 40-50% off.