Thanks Marian! I was thinking (while trying to go to sleep) that I should probably try to Google it. Not sure if I should watch the video as I don't want any spoilers at this point. I'm doing pretty good but it will be a shame if I get stuck and can't proceed because I have no hints left or something, which is why I'd like to know more about them. Then again, I guess I can look at 123Pazu's playthrough if I get too stuck, can't I.

What I'm really amazed by is that I keep playing this in the wee hours of the morning (when I'm ready to go to sleep) and I'm doing this good. I usually don't play games that make me think at that hour. Maybe that's been my mistake. Maybe my brain is more relaxed and works better then. Of course, it's not good trying to fall asleep afterwards. Active mind and weird dreams!

Edit: I did use the tutorial at the beginning but when it said to use the hint button, I didn't because I was afraid it would take one away from me that I might need. Maybe if I had done it, I would already know the answer to this!
2nd Edit: I found this: "Replenishing Coins: If you run out of coins, you can earn more by actively hunting for morphing objects, finding collection items, and completing bonus puzzle levels." This is where I've gotten my stars from. Maybe I need a certain number of stars or maybe the coins never show more than 50 but are there waiting if I need them. I may have to try to find out by using some but I'd rather wait until it is a necessity.