I use C2 for prototyping and I love it for its speed. Recently I've been trying to make a full game on it and it's holding up pretty well but I don't think C2 is quite ready yet. It's very much lacking in audio functionality, I don't think anyone can compete aesthetically with other games purely because of this technical limitation.
But - it's awesome, look at Mortar Melon, that's as polished and slick as any game of its kind could be.