Thanks for the comments MurphysDad, really glad you enjoyed it!
100% agree with your points to improve on, a restart button is a great idea and I see what you mean regarding you get hit by the hero, I think what happened there was we didn't look at it long enough to think "Oh that's a bit jarring" :'D I can definitely see your point on making it clearer that you can pick up towers and that it is in fact part of the gameplay experience.
Thanks for taking the time to comment, really appreciate it!