For the order in which to play the games? I would recommend playing Lovewood first, then Invisible Seams. You can also check out the shorter games (Frightwood, When Trees Turn To Ice, Living With Ghosts) at any point after playing Lovewood, but that is optional :)
Ooooh right, sorry! In that case you can play the smaller spinoff games in whatever order you like. Frightwood is more whimsical and is chronologically the first. When Trees Turn to Ice and Living With Ghosts are more serious in tone. :>