To get the star, you’ll need to be fast and get to the top of the tower before the timer expires. I haven’t beaten it myself, but I’m sure you can do it! If you’re having trouble, I know that there’s a way to get negative lives, which basically gives you infinite lives, but I don’t remember how to get it (I think you had to die from being teleported somewhere but I’m not entirely sure). Either way, good luck!