I dunno, you're surrounded to begin with right? If you get pushed out of Ste. Mere-Eglise, it's either back to the beach or be left behind in enemy territory.
I'd say move on with the company, link up with friendly forces in Ste. Mere-Eglise and hold it untill reinforcements arrive. Think you'll need full strength to hold it anyway.
Not sure a lone platoon can do much to hold a town to begin with. The element of surprise is gone; they will be pushing back soon enough.