Nice! A good simple game that works well for the 20 second time limit. If you were looking for a way to improve it you could try adding sound effects and music. That can really make a game feel more fun.
Sounds really add an awful lot to the experience of playing a game, even short ones. You can see it in a lot of the games in this jam, where the dev has added some fast paced music that makes you want to play the game more quickly and gets you feeling more tension as the twenty seconds rush by.
