All things considered Brass Tactics is the best RTS game for VR right now; compared to other offerings it retains much more of the depth and complexity which makes the genre so beloved by many. That said it doesn't quite have the gameplay detail of the beloved giants of the genre in the non-VR space, and other niggles like the lack of coop or the shortness of the campaign keep the game from true greatness. While it may not be remembered as fondly as Age of Empires 2 it will probably be remembered as the first RTS to really do VR right, and that's still pretty good.
Marble Land offers some satisfying puzzles set, in a relaxing environment. While it doesn't do anything particularly novel it is well executed. Marble Land is not a particularly long game and will take a few hours to complete at most, with no real replay value which is of course to be expected with a puzzle game, which should be borne in mind if you are considering a purchase. Marble Land is available now on Steam and the Oculus store for $14.99 or regional equivalent.
There are better examples of rhythm games for VR (Audioshield being my personal pick), but Seabed Prelude is distinct in that it does have a story and some alternative gameplay between songs. This is a game which is probably best for people who have played some similar titles and want to vary things up a little without spending too much.