The trick with these kind of artistic games is to keep enough playable content in it to keep it "fun", with sufficient, yet fair, challenge for Flow (see the work of the psychologist Mihaly Csikszentmihalyi). This game pulls that off. Only downside is that some of the philosophical stuff is handled in a rather heavy-handed way. Yet the experience is enjoyable overall, and the level of creativity (particularly visual effects) leaves a lasting impression.