1. Not correct, it's a piece of a sentence. "While" typically means "although" in this sense, so it would have two parts.
While the sound of the engine roared, I tried to turn the key in its lock.
(Correct)
2. Correct. There will be a soccer game tomorrow is correct and there is nothing else necessary to add in.
3. The snow stopped after dinner, (SO) we decided to build a snow fort.
Fragment
4. Correct. When or while usually has two parts of the sentence. "When I said goodbye" is a fragment, but "When I said goodbye, my cat clawed my leg." is correct. It is complex, compound sentences are always conjoined by clauses with conjunction words like and, but, so, etc. There is no conjunction here.
5. Same thing but still Correct. When or while usually has two parts of the sentence. "When I said goodbye" is a fragment, but "When I said goodbye, my cat clawed my leg." is correct. It is complex, compound sentences are always conjoined by clauses with conjunction words like and, but, so, etc. There is no conjunction here.
6. Compound, it's conjoined with and.
7. Compound, it's conjoined with and.
8. Compound, again, it's conjoined with and.
9. Correct. Although usually has two parts of the sentence, so it would have a comma inbetween the two clauses.
10. It is correctly punctuated.
11. Put a comma after movies.
12. Incorrectly punctuated