Perfect Stride, Perfect Skybox

This is what happens when you collect all 169 triangles in Arkane Kids' "maximalist skater" Perfect Stride,  then press the secret X key.

Perfect Stride is part of the LA Game Space Experimental Game Pack 01, which was part of the rewards for pledging to their Kickstarter, but is now available to buy for a limited time. 30+ games for $15, well worth your pizza money.