Use of readability function on writing software

Hi

I'm new to writing fiction.  I'm using a computer package (Papyrus) as a word processor and I have been using the Readability function.  The readability highlights a paragraph in different colours from red (highly technical) to dark blue/purple (childlike level of reading ability).  

I'm writing a piece of fiction aimed at adults.  But the readability is highlighting a lot of my writing as green or blue, which indicates the readability is suitable for young adults.  Is this OK or could it mean that I'm "dumbing down" a bit and making it a bit too easy to read for the intended audience?

Thanks