Thanks man! I'm glad you like it!
There's no scroll bar but you still should be able to scroll down using the mouse wheel. With that being said, I will try to get it better responsive.
The tree like is a good idea, but at the same time I don't know how to display it in such a small space yet. Let's see.
Enemies actually drop gold, which can be used on Shop node. I used to put a chest after each fight but then the game becomes too easy lol. Will see if I should bring it back