Both Prostrata and Abrolhosensis have similarities to Mille's.
And it could very well be either. I would say the vast majority
of the time it's an educated guesse at best from a picture.
As to the Slimer question.
It does'nt look like one to me, but it could be one that is extremely
stressed.
For that matter it could be a Prostrata that is extremely stressed
too.
Here is a Bali Green Slimer (Yongei)
The slimers really reveal themselves as such by the snot like slime
that they produce when irritated. Slimer is the common name
given because of this attribute. There are several species that
could be called Slimer, but still be different.