Really cool game! The concept is unique and i also love the graphics and audio. I think it's a good choice to not add any music, cause like that you can really concentrate on the gameplay.
The tutorial is also really good, but i did't get at first that your goal is to prevent crashes.
Another thing that was a bit annoying was, that the planes and all the important graphics in general are very small. I sometimes lost because i didn#t see the planes.
Other than that, excellent submission. If you want to, it would be really cool if you could check out my submission too. Thanks! :)