Hello Fort,
Thank you for playing the Mining Wizards and even make video out of it!
Grealty appreciated. About the hidden skill tree - I also thought quite a bit about it and my conclsion was to find out while player experience the game.
There could be many reasons,
- benchmarked similar games
- increase the game speed so it doesn't frustrate players too much
- pure explore of the skill tree
and so on.
As you have reminded me, I'll get more feedback and research on it