"A work in progress but hey I did something" Isn't that what all of us are saying ;)
This may be a work in progress, but it has an enjoyable core concept that you can continue to build on and refine! The tank controls very well and the missile does exactly what it's supposed to do: Track the player. Sure, it appears that I can park my tank behind a wall and basically be invincible, but little refinements can address those types of issues. Maybe the missile blows up and a new one spawns? Maybe the missile has a bit more brains and learns to curve around walls? Maybe the score isn't just purely time-based, but based on distance traveled. The possibilities are endless.
Keep refining and what's currently a fun work-in-progress will turn into an even more enjoyable full-fledged game! Nice work!