Oh, that definitely wasn't supposed to be hidden! I may need to rethink how the tutorial is presented since a few people have missed the skeleton killing mechanic. Anyway, thanks for playing and glad you enjoyed it!
For me, it's good as it is really. When you discover it by accident it's funny and satisfying, so even if your intention was to make it more obvious, I'd say that this is a funnier way to introduce the mechanic :D
