While pasta cooks, cook up vegan bacon according to package instructions. Dice into small pieces. Set aside.
Drain pasta, reserving 1/2 cup of the cooking water just in case it's needed.
To the cooked pasta, add pumpkin, cheese, soy milk, butter and all the seasonings. Stir until cheese is melted. If the cheese needs to melt further, turn the heat on low and continue to stir until melted. If the sauce is too thick, add a little bit of pasta water until desired consistency.