I like the general idea, I definitely would like to see something like that, but:

1. This is not really gambling related, I don't see any chance/random mechanisms, it is skill based game.
2. Simple games like that can be easly abused and are prone to scripts/bots. There is no way to prevent that.
3. For a bitcoin powered game, to be really competitive and not abusable it should be much more complicated.