I posted this track for the pak5 contest back in September, but never here.

I almost forgot all about it, but recently a so-called "Music Library" contacted me and they wrote that they would pay me 200 euro to get exclusive rights to the track for five years.
They also want me to give them all rights to royalties for those 5 years, which sound a bit weird to me, but I have absolutely NO experience in this business, so my questions are:

Is 200 euro a normal/fair price for exclusive rights for 5 years?
Should I give up on royalties for those five years?
Is that normal practice?

I was tempted to just say yes, because I didn't think much of the track, but on the other hand I know that we are not very good at judging our own songs and the value of them.

Here's the song:

https://soundcloud.com/user-656274325/autumn-colours

Advise will be much appreciated!
Will