Thrack, your spectator levels are becoming increasingly more fun! That last level was awesome!
About the hovering, try putting 6 to 8 connected pieces of rubber around the ball, tensioned to 100% red. It will spin so fast, it actually breaks the rubber. The spinning ball is a nice bug
That counting to four is awesome too! very nicely executed!
You could make a level that adds numbers... it would use basic cogs, like the earliest calculators...