Not a bad start. :3
It's not a bad start. It just needs a lot of improvement. :)
1st of all, make sure the AS is clean and good explained.
2nd, make sure there aren't any bugs in the game cuz that makes it really shity.
3th, graphic improvement! Everything looks really messy and not everything is really smooth. Also make some FBF animation, that makes everything looks better.
4th, sound effects! For now, you only have 1 sound effect. A stupid shooting sound. x')
You could use some different shooting sounds, background music, a sound if you hit something, a sound when the tank is driving, etc. Just use your fantasy! ^^
So for short, your game needs a lot of improvement but with enough practicing I'm pretty sure you can make something good of it. :) Just keep it going!
I really hope I helped you a little bit,
Bertn
PS: one last thing, change the height of the flash cuz for newgrounds it's a little bit to big, it's only possible to play, and see everything, in pop-up. :')