The creator of this game initially did it as a game design challenge: is it possible to create a game where the mechanics center around zen and meditation rather than action and challenge? Conventional game design wisdom says no: entering Csikszentmihalyi's flow state requires challenge, not relaxation. On the other hand, a few games have tried this before (Journey to the Wild Divine being the largest project I know of), but few have done it in this minimal a style. Conventional wisdom, apparently, still has a way to go.
The game itself works well for what it does. I'd be hesitant to describe it fully on PTT (a full description of the mechanics acts something like a spoiler) so it is best to play it first. Basically, it forces you to slow down and move your mouse in a way that's deliberate and relaxed, in a way that we are really not used to in normal computer use.
The simplicity of the game along with the music (which is probably necessary for the complete experience) is something I found was worth experiencing. The game may not offer 100 hours of gameplay, but for five minutes, it gave my game designer brain a lot to think about.
Is it a perfect game? No. If I were to criticize, I'd say that the interface itself got in my way more often than not: if my mouse bumps into the side of my desk, I lose quickly, so instead of entering a meditative state I'm constantly thinking and adjusting for the physical location of my hand and mouse. Still, as an experimental game that's trying to push the boundaries of game design, I think it is definitely worth taking a look at.