I didn't go through each link. I'm not sure how deep in your assignment covers (top page only?)
But my comments would be this.
1) each page have a very different look/feel. Ignore this if you only designed the first page for your class.
2) the joystick is at a different angle then the buttons.
and what others said (button presses should be shown, coin button should do something, maybe even play a sound of a coin drop.
And if you want, you could have the icons/images link to online versions of each game maybe? but that might be too much.
But I like the overall look / feel. I think it might be a bit busy on the page. But I don't like pages with ever inch filled. The Click on buttons... I think should be removed. Might be bad for a class though... but who whouldn't know and why would that be the second largest font? But I can see teachers pushing instructions.
Anyway, good luck