1.) Is the process of building and upgrading a tower intuitive? Do you have a good sense of the range of a tower?
I think its a little too easy to upgrade the tower. many times I would try to click on the tower to see stats/range and it would accidentally upgrade it.
2.) Besides a bit more information regarding the specifics of towers and upgrades, is there anything you feel would improve the user interface?
Being able to zoom in and out around the map to better gauge how many enemies are coming.
3.) How do you feel about the difficulty of the game? We aimed for the prototype to have a rather high difficulty, as we wanted players to hit an end point (losing). Compared to this, what sort of difficulty would you like to see in future versions (Easier, much easier, about the same, harder because I'm a masochist, etc.)?
I got to round 20 before quitting. I think the difficulty is in a good spot and you can really capitalize on the whole rebuilding is required aspect.
4.) It's hard to tell (especially with some graphical glitches we're still running into), but each tower does subtly show its health. Did you notice this fact, and if you did was the display useful?
I did not notice it on my own but after reading this it was helpful to for placing slums as walls.
Finally, if you encountered anything you think might be a bug during your time playing, we'd appreciate it if you let us know!
Nothing major, just layering issues with some towers and the HQ. Really like how the drones move around!