Originally I thought you had to match the top of the cube with the colour of the other cube, I didn't know you had to touch the side with the matching colour. Some clarification would be useful.

Aside from that, add collision/walls in order to stop you from rolling infinitely to make the puzzle more challenging and interesting.

Very cool concept. I think its a cool game to master. its like a Rubik's cube, at first you have no clue what is going on but as you play more i could see the player learning the algorithm's needed to complete more challening puzzles. 

I like the concept and I like how it looks.

Personally I find the WASD controls a bit unintuitive with the isometric perspective,

maybe consider a different control scheme

Cool idea!

I think it'd be nice to have a clearer idea of what side is the right side, maybe that it's on top of everything else?

I did have some issues with actually matching the walls, though, I think partially because the playing field is pretty big - having a more restricted playing field could probably help with getting the puzzle right!

Very cool idea. Got the answer purely by chance though. It was pretty hard to figure out where the yellow face was on the cube

fun concept, reminds me of some old flash game. a bit short, could see some expansion with multiple colored blocks at the same time so that there is only one way to solve it. 

The game plays very nicely, but there is a big factor of chance and luck at play. Maybe the walls should be placed at the edges to make it harder to match the colors or have the player match multiple faces to progress before ending the level.