There are tons of great videogames that fly under the radar. The ones I personally really recommend are the VR ones. VR itself is a complete new way to experience videogames and I really feel that it is completely underrated. It feels like many games do not dare to use the possibilities to the full extend due to some players getting motion sick. I actually get motion sickness in some games but there are ways to deal with it, for me personally and with the right settings in game.
Anyway, here are the games that really amazed me.
The Solus Project: Stranded on a strange planet, looking for a new home for humanity, you have to find shelter from freezing storms and find a way to contact the colony ship before they run completely out of supplies. Just part of the story though, no real time limit in game. The survival aspect can be turned down or off and the exploration of the different islands is really amazing with lots of secrets and a great story behind it all. And not just a "fun-sized" experience, it took me about 30 to 40 houts to finish the game. And yes, VR is completely optional, but without it you just have a 7/10 survival game, in VR it's about a 9/10 and easily one of my favorite VR games of all times.
Here they lie: Games in VR can be scary much more easily than flat games. Even though HTL is more a walking sim with some monsters to avoid, there were moments in which I had to remind myself that the game would not continue without me walking on. The atmosphere is really intense and the story nicely philosophical. It's something that stays with you a long time and well worth the ride.
Until Dawn - Rush of Blood: First of all, it has not much to do with "Until Dawn" and even though I really love that game too, it is in no way required to have played it before playing Rush of Blood. RoB is a very fun lightgun horror rollercoaster. In VR. And it's really great, without any problems with motion sickness. If that doesn't get you interrested, nothing will.