Sugar Stars??

I did not start getting sugar stars till level 2347 and they only appear after I've gotten 3 stars and kept racking up points, which leades me to believe they are to show you have gotten well over 3 stars. I think the sugar stars are an interesting new add they may not give rewards , but they are another side goal to work on in order to make the game more challenging by not only passing the levels but achieving 3+ stars as well.

Really dislike timed boosters 99% of the time their useless.  Just another way of King wanting you to spend money.   
You get nothing for the sugar stars.  No longer build your boosters 

I’m still trying to determine if getting multiple sugar stars in an episode is of some reward? I’m not able to do it consistently yet. Since this is in testing—perhaps the idea is to do that in the future—give rewards for various collected amounts. I was so excited the first few times I hit the stars but the excitement has quickly waned now that I realize that nothing happens. 

RE: "Sugar Stars are a new mastery tier coming up after your regular 3 stars. It's a sign of your amazing sugar crushing skills!"  From Jelly Jenny
You know, when people work, they expect a paycheck at the end of the work period.  They'd be pretty stupid to settle for an "Atta Boy" or a pat on the back.  
When we invest time in a game, we anticipate some advance in our point count or in this case, a booster of some sort when we pass a level.  To have 3 sparkly stars appear means nothing unless there is some other value that improves our score or advances our play in some way.  These stars have the same value as the golden crowns for passing a level on the first trial--0.

I think the stinginess of boosters over the last year may signal a decline in designers' ability to create new levels or something...otherwise, why not restore the space ships, which over 5 trials yields a good batch of boosters.