Some user-interface issues, but cool game!
If this is your first Flash game, then well done! I like the use of power ups on the field. Very interesting for an RTS! The artwork a pretty good quality too.
I think the controls would have been better if there was a mouse-controlled menu system instead of buttons. The buttons for scrolling were fine though. Also, the building of a tank was kind of redundant, since you needed all three parts to have one at all. I would have just had a "build tank" button to press.
At least as of this review, the "scores" button is not doing anything. Just to let you know.
I can tell you know how to program and have a good eye for game design. I think you just need to polish up the presentation a bit. I hope to see more!