Ah, I hate to put a "no" review for Proteus. It's a quirky little game that has some heart to it.
Proteus is one of those 'experience' games a-la Journey where the enjoyment is in experiencing what is around you. For what it's worth, Proteus does offer a lot of charm; the background melodies combine with the various sounds of your island to create a hypnotic symphony. The wide open environment reminds a lot of Minecraft, only in a beautiful cell-shaded manner.
But unlike Minecraft or Journey, Proteus lacks any form of gameplay. It consists of wandering around until you find something that piques your curiosity, investigating it, and then leaving. And there are a couple non-standard things to find in Proteus; if a player feels like they're being led somewhere, there's probably something to find. Alas, there could stand to be way more of these curiosities, as they are too few. Exploration is all that Proteus has, yet Minecraft does it with wider worlds, more mysteries, more gameplay, and the ability to express one's own artsy fartsy tendencies rather than just experiencing those of another.
If you got the game as part of a bundle, it may be worth it to play; the experience is very serene, and the way the music synergizes with the environment is wonderful. However, even though the game may be "art," it is missing an actual game, and I would not recommend its actual purchase.
Exploration games are an excellent concept, but it needed way more to be as memorable as something like Journey.
On a scale out of 10 where 4.7 is considered "average," this game would rank at a 3.5 - has potential, but doesn't necessarily meet it.