In this Game Jam, you will only be restricted graphically.
Your game must look like it's displayed on a 16x2 LCD character display, just like these:
Specifications you must follow:
1) Each character may be either 5x8 or 5x10. They must be spaced between themselves.
2) You must only use two colors for displaying: a background color and a foreground color. Here are some color scheme suggestions:
Now, you can do whatever kind of game you want, as long as you follow the graphical restrictions. A text adventure, a snake game with half block characters, an arcade-style game... go wild!