Thanks for the feedback, nephariuz, it's very much appreciated!
The project name I use for this game, before I published it as "Harvest 100 Shapes", is "Grindclone" as the gameplay apes Capybara's "Grindstone" :D I haven't played Wario's Woods or Same Game, but now I absolutely will!
You're right that matching rotten shapes aren't beneficial, they're more or less like empty square that don't require a matching shape and don't add to the path power or socre.
Your path needs to go _through_ a goat where your path power is greater than 10 :D Oh and goats also act like combo shapes where the path can match on a different shape.
I'll try to add some more text in the description for anyone else who might play and has the same questions.