I think you should focus on making one good game than making three mini games, I think the rythm one could be quite fun if you just slowed down the buttons a little.
My another important suggestion is to make it playable on browser rather than making it downloadable. Less people play the downloadable games because it takes more effort. So making it playable on browser would possibly double the feedback you get.
And if you are a beginner don't get discouraged by not being able to make awesome games. Because everyone who makes awesome games in this jam was once making bad games.