Thanks for giving the demo a try. I'll have to double check the transition screen for bugs as usually a click of the fire button progresses to the next area (although the demo only contains 3 areas so you are correct in that it is short).
I agree with the camera comment, for me it is the weakest part of the demo and needs major work if I continue. There's been a few comments on the enemy attack patterns, difficulty too so there's been some good learnings taking away from DD69.