The music in the game is nice and all for when you're actually in-flight, but I personally don't find it very enjoyable when in the designer. Currently the designer plays whatever track was last playing, which is fine but I don't find most of the music fitting for designing things.
SimplePlanes' music was good for both flight and the designer, but this game's music is only good for flight in my opinion. Basically what I want is a dedicated music track for the designer (or multiple, but that'd be more work) that's something more like SimplePlanes' music (or even the original SimpleRockets 1 designer music) while still fitting this game's theme.
maybe throw in some SP classics, such as "Interstate"