Nice first prototype, I get the type of game you are going for. Just played a game against myself to get an idea of how it works.
The game might become more interesting with more mechanics, so there is a additional layer of strategy added to it.
Imagine the planes having specific movement rules and such. But also the ability to hinder the other player from reaching similar goals. Enabling the players to outwit each other would make it very interesting.
Good job on the release!