I'm on windows 10 64bit surface go 2 8gb with gold processor. Game starts and runs but mouse movement won't allow me to do anything. It is a Bluetooth mouse so not sure if that is the problem.

The GoG version was developed under an old framework that is no longer supported. I gave recently built new versions but as of yet have not been able to update GoG. IN the mean time you can find newer versions on www.thelordsofmidnight.com/support