Thanks for playing and for your feedback, I'm glad you enjoyed it!
I'm happy you had fun interacting with the environments, we will try and add more stuff to the later levels too, so they are a bit more fleshed out!
The star rating is based on getting the mininum number of clicks to complete the level at the moment, but I think it would be better in the future if we got rid of the stars and instead have multiple solutions, like you mentioned, and then show how many you have completed overall at the end of each replay. I think that might be more fun for replayabilty of the levels!