I have been playing Nimian Hunter for the past few days, or at least trying to get some quality time in with this amazing and unusual new game. Created by Robert Kabwe of Montreal, the game makes use of an engine that creates the illusion of 3D in Flash, and it's very, very good.
You play the role of Nimian Hunter on a mission to feed the beast/god/demon/thing that commands you. Just move the mouse in the direction you wish to travel, lasso in hand, and click the mouse to rope the moving creatures that you find near the bright green beacons. Wait for the lock-on indicator to appear for best results.
Once lassoed, your next task is to guide the creature back to the red beacon without losing it. Trees can break the rope and release the creature if they come in-between, so navigate the terrain accordingly.
It's an unusual gameplay mechanic and one that creates a decent sense of immersion with it. Even better is the narrative that unfolds as you play, which makes this game even more compelling.
Nimian Hunter is not necessarily a long game, but it does contain a plot twist and a couple of different endings that will have you playing through at least twice.
Cheers to Imok20 for suggesting this one! =)