Thanks for playing and for the very detailed review.
Most of your pain points were on my todo list but time constraints prevented me from reaching them.
My next item was going to be to let your select which type of defense each tower would be and yes the towers were supposed to ray cast to the nearest enemy in light of sight - sadly the shooting worked for this not the targeting...
I was also going to throw in WASD for movement and E and Q for up and down but again time prevented and my goal for mobile put this down on my list.
I will work on the movement/viewing/lifting-dropping as I roll it out to the mobile.
Sorry to hear about the wall thing, I thought my pathfinding prevent it from blocking, but the outside walls must be preventing that.
Noticed the color similarity when I was watching their death animation... I liked the texture but agree, maybe I just change the tint/hue to keep the pattern.
Thanks again for playing and for all the notes, I will be sure to come back to them as I work on the release.