Journey is more about the emotional investment, than the usual missions and score keeping that video games use nowadays. In Journey you can run, jump and speak, that’s all you need to reach the summit. By finding magical glyphs around the world you can lengthen the traveller's scarf which allows our cloaked-figure traveller to fly through the air and reach new areas.
Speaking in Journey means shouting out these musical notes which surround cloth creatures around you. They help the traveller to fly higher and further, and speaking can also activate other elements in the world, like ancient paintings or meditating at altars set between each chapter.
The playing mechanics are simple, more of a toll to help you experience the beauty of the world, it may be overly simple and slow paced for some, but it all functions perfectly inside the context of the game world.
Finishing Journey alone has its own charms, but it is extra special when you meet another traveller along the way. As you play, Journey seamlessly connects you with others, no names, no text boxes, no chat, and you know what? It works. The other figure travelling with you is a stranger, but you might end up playing through the whole game together without a problem. With a few chirps back and forth you can communicate, it is brilliant and some of the most meaningful multiplayer I have ever enjoyed in gaming.
Journey is really short, you can beat it in two hours or less, unless you want to spend time exploring, but that is no reason to deny yourself this beautiful adventure.