Thanks everyone for the great comments. Here is the latest version of my tetris game, and will probably be the last update until I learn more complicated windows programming ideas like fonts, menus, and child windows.
Here is what has changed:
-Press shift to rotate left, control to rotate right, and space to drop all the way down to the bottom. All other keys stay the same.
-Fixed the problem of the colors being too dark sometimes. It didn't dawn on me that my random color schemes could sometimes pick black! :)
-Game is sped up a little bit
-You can pick your starting level as well as how many lines of random blocks you want to start off with. The higher the starting blocks, the more bonus points you start off with.
-Had to scale down the point levels. For some reason the program crashes when your score gets above 99,999. It totally screws up the drawing mechanism when it tries to print a number one hundred thousand and higher and I have no idea why. If anyone can explain to me why this happens I'd appreciate it! :)
Also, I still welcome any comments or ways I can improve it!