The question asks which Gujarati film won the 70th National Film Award for Best Feature Film promoting national, social, and environmental values. The options provided are "Hellaro", "Chhello Show", "Kutch Express", and "More than one of the above".

Let us examine the given options to determine the correct answer:

• Hellaro: This is a Gujarati film that has won national recognition, but it was awarded the Best Feature Film award at the 66th National Film Awards. Therefore, it does not align with the specified category of the 70th National Film Awards.
• Chhello Show: This film is recognized internationally and within India for different awards but is not recorded as the winner in the specified category at the 70th National Film Awards.
• Kutch Express: According to the information provided, this film won the 70th National Film Award for Best Feature Film promoting national, social, and environmental values. Therefore, this is the correct answer.
• More than one of the above: This option allows for multiple correct answers; however, based on the information provided, only "Kutch Express" fits the criteria for the specific category and year mentioned.

Conclusion: The film "Kutch Express" is the correct answer as it is confirmed to have won the 70th National Film Award in the specified category, making it the film that best promotes national, social, and environmental values as per the stated awards.