Thank you for taking the time to write such detailed feedback!
You pointed out several issues that I completely agree need improvement. Balance is still very much a work in progress, and it's helpful to hear that Flame and some combo setups are currently too dominant. My goal is for resource routing and build choices to create meaningful tradeoffs, not for a single strategy to solve everything.
The performance issues and the enemy teleporting bug at higher game speeds are definitely not intended, and I'll investigate both. Thanks for describing when they happen, that makes them much easier to reproduce.
I also appreciate the UI and skill tree feedback. The hover panels, zoom behavior, node readability, and tooltip inconsistency are all things I plan to improve. The suggestion about highlighting nodes that use a hovered currency is a nice idea as well.
Thanks again for giving the demo a thorough try. Feedback like this is exactly what helps turn an early demo into a much better game.