Nice job with this, the whole aesthetic looks cool (the shadows are a nice touch) and the music works well.
Found myself getting a bit confused with the controls sometimes, but WSAD on an isometric grid can sometimes do that. It also took a while to realise that it was the side of the die facing up when in the place of the target, and not the side facing up when next to the target (I think this was especially confusing at the start since sometimes it would work and you'd collect the target die by accident and then other times you'd die and have to restart).
Similarly I found that (since only 3 faces are visible) at times it'd just be guesswork trying to figure out which face would be on top after a move - if that face was previously not visible (basically remembering which face was where). This was originally a bit frustrating, but I got used to it after a while and it just became part of the challenge.
Overall though, this is a sweet and enjoyable game, so well done :-)