The action tree mechanic is really intriguing, and I think it could be very fun. For me, it's very counterintuitive. It feels like an everyday game mechanic from an alien planet, in both good and bad ways.
I guess that's just to say, I suck at your game, but I want to git gud!
A little more explanation about the chain of events would help:
Click and hold->move to choice->move back to where you started holding->either release to execute the action or right-click to cancel.
Based on other games, I thought it would just be "click and hold->drag to choice->release"