Chunks is now available as an early access title on Steam, offering the chance to play in a block based sandbox environment from Facepunch studios. Though this is listed for Windows, it is created for virtual reality, and is heavily moddable, much in the vein of their Garry's Mod, and at this point one of the functions included is the ability to create a functional roller-coaster. They explain this is all quite early, so they are eager to hear from you if you think Chunks blows chunks:

It’s still quite early in the development of Chunks. But it’s an exciting point to be at.

It doesn’t have a sh*tload of stuff to keep you super engaged yet. There’s a bunch of quality of life stuff we need to do. Some menus are confusing. Some of the tool controls are confusing. We’re totally aware of all this stuff.

But it’s cool and has a ton of potential. We’re really proud of what James has achieved with it. At Facepunch we have a history of long term development of our games, we don’t expect Chunks to be any different. Feedback is really valuable – so if you play it and something is tricky or confusing, please let James know. Especially if you have already refunded it because you hated it.