A quick and dirty pachinko board I made in about 2 hours. It has some physics issues (specifically if you can get 3 balls to collide at once or hit the side walls with very little vertical speed) but plays fine.
There's no end state or anything to do with the points or balls you earn.
This was just done as a proof to myself that I could.
Click on the right button to launch a normal ball (these will replenish somewhat if you run out)
Click on the left button to launch a golden ball, which has the same physics but earns 3x the points and double the ball rewards.
Only planned extra content is extra boards once you get a surplus of balls.