All games are a variation on the theme of "Tower Defense."
Games should be polished.
Games should have a start screen, win/lose, restart options.
Games should have sufficient instruction for players to understand how to play.
Games should have audio that supplements the play.
It should be possible to win and lose each game.
All contributors should be named in the game.
All games should have a short video that can be watched that sets appetite for what's fun about the game.