Thank you for your comment!
I actually tried to draw an arrow toward the direction the red star is going when launching, but couldn't get it to work sadly. So I scrapped it.
There's four level in the game, so I think you reached the last one.
I noticed the problem with buttons too late after uploading the game, but yeah it's weird. I actually set them up weirdly. Anyway, jumping again on the button fixes the problem.
Thank you for you feedback :)