How about a game about a little yellow man shaped like a pie who eats little white dots (big ones too) and sometimes fruit. And his enemies are four ghosts who kill him on contact. I have a feeling this will turn out to be a great game!
I reckon a trench warfare game, from the above view, where you choose certain units and you strengthen your defences in one area and you counteract what the opponent has using strategy, such as if a person has 50 tanks in one area, the person would mass produce Bazooka troops in that area.
How about something where you are trying to get out of a maze, and if you take a wrong turn there's a trap there and you have to push a button really fast to escape. Then you go back and try to find the right turn. How about that?