Just like life... you must keep running in circles, getting better and faster as time goes by. Keep your speed by collecting speed boosts and avoid your shadows selves to avoid a game over.
The theme behind this game is that life is an endless cycle of constant improvement, and the true mark of success is simply being better than you were before. The shadow selves also signify not being caught up in the past and just keep moving forward.
Like always, have fun!
(P.S. the bubble is actually really entertaining.. if ya dont get it, ignore this lol)