After 13 hours I beat the game 100% and got all 48 stars and the 3 golden gnomes.
From that experience I really suggest you don't make the Gnome Award popup every time you beat a stage 6 boss because that unskippable dialogue gets a bit annoying while going for a 3 star run on hard/long maps.
Also found a bug where it I would always get the last golden gnome popup 
despite only having 17/18 stars in the tag team tournament when ending last stage with another 2 star run.
Insanely fun and unique charming game.
