I don't know. But it would be very hard. A good piece of micro fiction requires a character arc, or the pivotal moment of that arc.

But in a novella, you need action, and slower bits in between, and the building up of the arc too.

It could be done if you add more stuff in between, probably. But simply pure microflash stitched together would do injustice to both your micro work and your novella. ;-)