Hey, sorry for the late reply!
First of all, thanks for the feedback, we used it for the latest update. We made a new build, and fixed the volume issues. As for the range indicators, we'll see what we can do, but it might be to complicated to implement because it increases based on many factors during the game. We'll most probably have it in the full game, but no promises if it will come before that. We rebalanced the tower defense part, so it's less punishing, and it's now passable - not easy, but doable. Also, should be less grindy.
If you're up for it, give the new version a try and let us know if it's better now :)