In a large heavy bottomed pot, heat the oil. Season the venison cubes with salt and pepper and add them to the oil, browning them on all sides, about 5 minutes.
Add the lemongrass, garlic, onion and ginger and stir until it exudes its aroma, about 5 minutes.
Add the bay leaves, cinnamon sticks, nutmeg, chili flakes, and curry and stir well.
Pour in the coconut milk and chicken stock, and stir. Cover and let simmer for about 2 hours, until the venison becomes tender.
After 2 hours, add the squash and cover. Let cook until the squash is tender and the venison cubes fall apart easily.
Garnish with cilantro leaves and serve.