Will people like an app that will ask them state their mood first and help enlighten their mood??

Me - yes. But it depends on the means by enlightening the mood. The system should know a little about me (gather some info) to provide tools I find valuable.

'enlightening the mood' sounds very generic here. Can you me more specific about what do you actually mean by that?

Hey! The idea sounds absolutely amazing. I would just suggest one thing- many times people are not able to categorize or exactly point out what mood they are in. So the app asks me a few basic questions with scalable emotional answers and then analyses my mood, it will be a lot more beneficial!