The game board seams rather wide. Yours is 16 boxes wide where as most other tetris clones are 10. 16 to me makes it seem a bit to easy as there is almost always somewhere to put a piece. Just something for you to think about.
Take drawing and updating out of the main thread so that the game does not freeze when the window moves.
The high score screen looks very cluttered.
When in the high score screen or the about screen, when you click on the close button, it does not close, but instead it goes to the main menu. This is probably intentional, but I don't really like this behavior.
For release versions you might want to compile it as SUBSYSTEM:WINDOWS so that the console will not show up and leave it as SUBSYSTEM:CONSOLE in debug mode.
Overall this is very well done. It looks very stylish.