I played through the whole campaign and a few challenge maps. Had a pretty good time with it. The only thing I thought was a bit clunky was having to press the Next button to advance dialogue. Most games I've played will allow it to advance if you just click anywhere on the screen.
Didn't notice any obvious bugs, but sometimes it seemed like enemy towers could take damage from their own splash if they hit one of my units close enough to the base.
Thanks for including a text speed option.