It is enough to end the level 5 no matter the number of stars.
For the success of stars, it is necessary to make 1 993 000 points minimum to have 5 stars.
For the success of the secrets, there is 2 in this level.
I leave you the video with 5 stars obtained and 2 found secrets. At the beginning of the video, you will have images with the location of the secrets.