I really dig this mechanic! There's no greater feeling than swinging around.,I just wish it was a little more forgiving! The instant death when touching water I feel could be replaced with a timer, that way attempting to pull myself out of the water would add some excitement and tension (literally!). One time I flew just a little higher in the map and it reset me back to the start. Stuff like that made an otherwise zippy and fun game kind of discouraging!
The first few times I played the game I didn't even know there were keys besides using the mouse! But when I returned to the game with knowledge of the keys, I didn't quite use much of them besides moving left and right. I'm probably not picking up on a lot of the mechanics!
Sorry, I'm not trying to be harsh on the game. Even just using the mouse buttons I really enjoyed it! I don't think there's a soul out there who doesn't like a good hook-shot mechanic!