Nice artwork and a fun game premise. Plane could probably visually stand out a bit more from the sky (the red and blue colors are a bit too close in terms of brightness and saturation, imo) but otherwise I liked the palette and the artwork.
Wasn't really a use for it in this game, but I did like how letting go of the mouse would let you fall but click it again would zip you right back up, or even spin you around if you'd moved your mouse. Could be an interesting mechanic to explore for more aerobatic movement.