First truth first -- the curriculum team at Code.org has often sat around and actively wondered if the Digital Scene project was enough for the Create PT. It's pretty close, right?!?!
But based on the spirit of the Create PT (v. what the rubric actually says) it felt a little shallow, especially in the "program with a purpose" dept. Also, given that many thousands of students are using this course, we actually worried about what would happen if, say 10,000 students submitted turtle drawings for the Create PT whose purpose was "personal curiosity" :).
My fast-pass, low-bar solution for algorithms was: anything with an if-statement. Boom, algorithm. Because it has conditional logic, easy to justify. For the Color Sleuth project then, you have several functions that make decisions with if-statements - the most sophisticated being the gameOver condition - and they are obviously being combined.
FWIW I think this "combining algorithms" thing is going to be tricky for EVERYONE. It's not a programming language thing. It's a kind-of-odd-requirement thing. In some ways I pity the exam readers who have to make these distinctions. To wit: if you write two functions that do separate parts of your program, and then write a third function that uses both of them, have you just killed two birds (algorithms and abstraction) with one stone?