https://www.youtube.com/watch?v=IFUj53VwYvU
https://douglasdwyer.github.io/octo-release/ (online demo)
Lately I've been addicted to watching (micro) voxel engine videos on youtube. I need to resist my urge to write one (not that I think I would do a particularly good job). I've also found the voxel engine by John Lin to be particularly impressive.