It works, (oddly enough the keyboard/joystick control worked far better on my tablet than the touch control setting did), but it's not great.
The sound is fine, but the game itself is lacking.

Everything is a circle, which makes telling things apart difficult- especially when the "player" circle shrinks to the same size as the rest.(doubly so if green or red is selected as the player's color.)
Why are there three colors of circle?
The red is definitely an obstacle, but it's not clear what green and yellow are supposed to be.
If they are also obstacles, why are they a different color and have no effect on my score?
If they are something else, why are they having no obvious effect on the score or the player circle?

Why does the player circle shrink?
Is it a debuff, a timer, or a compensation for the eventual build up of tiny circles?
What causes the game to end- it just seems to happen at random???
Why did I get a higher score sitting in place in the initial spawn than from actually attempting to play?
Why is single player mode called "background"?

The arrows that change the background design work, but I only found them by pure chance and the lightning backdrop appears to have been either placed improperly or the file itself was cropped wrong.

It's not a bad start, but it's not ready yet.