Really appreciate the feedback, thank you!
I agree, balance is off. It is one of those things that is far from finished/good.
Blue resource does have the same scaling as green, it is just not part of the demo skill tree as demo doesn't use much of it.
Penetration shot and explosive shot are things mentioned by a lot of players so that is definitely something I'm going to implement next.
I'm open to any kind of ideas, as this game will have to have many more skills to be interesting for more than 30 minutes. And I will definitely check out your games!