I think you shoud make more than 5, but make sure not to make too many so you have time to fully flesh them out and make them feel good. :)
Thanks for the Suggestion :D. I'm planning to make quality over quantity. I'm trying to make each level have a different feel and mechanic to explore and my creativity is hitting rock bottom after 6 :/ . Ill try go for 8 - 10 do you think?
Sounds good, do as much or as little as you want and feel fits the game!