Great concept. I especially enjoyed the balance you've struck between the speed of travel and the slow handling of the missle - it adds just the right amount of challenge.
At first I was concerned that only level 1 was available, but then I saw someone in the comments mention a "next level" button which I'd not noticed lol. Make that button glaring next time because the game (for me at least) did not progress automatically to the next level after completion and so I had to manually each time. I'd always try, for GameJams at least, to include some sort of level selection system just in case your level management logic fails.
Really cool experience overall, I'd very much like to see something like this made into a fun mobile experience or a deployed as a web game.