Proteus is a really nice relaxing interactive-art-game-experience-thing. The warm, shifting colors fit perfectly to the soothing music, which alters depending on which element you pass. The sun rises, the sun sets, seasons go by until a year has passed. And you wander around, unwinding and enjoying the scenery and finding little eastereggs everywhere. Day and night have their own secrets, as do the seasons.
Still the game does seem to be a bit short lived. The island is just not that big and after a couple of playthroughs (which mostly take around 40 minutes or so, depending on how long you choose to linger) you've seen all there is to see in this world. It would be wonderful to see this changed in either an update or a sequel. Bigger islands, more elements. That's basically it as far as I'm concerned.
In the end I enjoyed Proteus, although maybe not for its full €10,- price (at the time of writing this review). It left me with a taste for more; I might even acquire Journey, The Unfinished Swan or replay PS3's Flower just because of this.