I just finished playing your game!
This was a well designed game with a neat mechanic. I enjoyed looking back and forth between the two games to plan my next step. I felt like it was challenging enough to keep me engaged, but not too challenging where I wanted to quite playing. Those dang spikes got me more than the clouds! I kept thinking the game was glitching out, but it turned out I was hitting the spikes on the other screen haha.
I'd say just crank out some more levels and tell us why they are linked together! I am sure you can come up with something creative! ;)