Volcano Escape by itself is definitely worth the $1.99 its developers are charging for it, but the optional in-app purchases are definitely overpriced. Still, if you don't mind being locked out some of the game's content, you won't miss out on much.
Volcano Escape is certainly cute, but it's also clunky and frustrating at times. It's good, but not great. This is one of those titles that feels like it's on the verge of realizing its potential, but it isn't quite there yet.
While Volcano Escape has flaws, it's still a simple jumping game at heart and the challenge of beating high scores may make it worth going back to. It's one of the best looking games of its type, just not the best in terms of gameplay.