Good game. Though it's worth mentioning that the timer does not reset when resetting (R) the level. If you wanna have another go at getting stars, be sure to go back to the menu and select the level again.
Also, the timer seems to be a bit off. After reading AarJay's comment, I was keen to get 3 stars on level 7. After a while I finally got it right and finished it with the pointer on the timer being (only just) in the green (3 stars). However I was suprised to see I only got 2 stars.
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That should not have happend indeed, ill look into it. Will update the game soon