Over a year ago I posted about a little indie game in development called Overgrowth. It's the sequel to a little game called Lugaru. Anyway, it's not done yet, but it's looking more amazing than ever, and I just want to remind you about it.
There's still no actual "game" per se, in that there are no clear objectives or story or anything of that regard; it's still mostly a sandbox experience. But the foundation has come a long way. Combat has gotten a lot more detailed, with weapons and reactions added in.
I could go on and on about all the different ways I'm impressed with the work these few guys are doing, but their alpha update videos more than speak for themselves.