Journey is a charming Japanese dojin game in which you play a pith-helmeted archaeologist attempting to recover all artifacts from a particular underground complex. It's not particularly challenging, at least for experienced platform players, but it is cute, and there is a bit of puzzle-solving involved in figuring out connections between areas of the game world.
There are no English instructions, so: First, the game starts in windowed mode, and if you have your screen set to low resolution, some areas won't appear. Hit F4 to turn to full-screen mode (which also seems to run more snappily, btw). Arrow keys to move, down to crouch, X to jump, and D to toss bombs, of which you have an infinite supply. Also, A brings up a screen showing all the artifacts in the game and which you have recovered; D puts it away.
Some odd choices have been made here; for one thing, the game scrolls up-down as you descend, but it's quite large on a left-right axis, and doesn't scroll that way. The result is that your character is pretty small, as are the tiles in the play area. Though there are some enemies, they don't seem particularly difficult to defeat. And there's no in-game save, so you have to solve the game in one session -- which won't take a huge amount of time, an hour, or possibly two at most.
Still, it's entertaining enough in a classic platformer way, and it's forgiving enough that even those of us who suck can get through it with a degree of perseverance.