Thanks so much for the feedback!
I completely agree about clicking to progress in tutorial. We went with space bar because I was afraid that players would accidentally skip dialogue, but maybe clicking a specific location could be a compromise.
I also agree with not allowing a round to start without towers, as with current mechanics there is no reason the player should ever benefit from doing this. We actually did have a fast-forward, but it was causing inconsistencies with how quickly enemies would kill towers and I couldn't get the fix done in time. I put it back in the most recent version and it will be in the next update. Wave indicator are a good idea. Thanks again for playing!