Usually just double-clicking the .exe file should open both Steam VR and the game. Were there any errors when you tried to open?
I know it's been a while but I figured better late than never (I completely forgot about this). the issue was partly mine and partly yours, I didn't have the correct openxr runtime set. it's partly my fault cause I didn't think to check it and partly yours cause there is no warning or anything of the sort detailing this as a possible issue. the game is rather short but enjoyable and the length isn't that bad due to it being vr which I know takes a lot of effort. sorry for not saying anything sooner but better late than never.