Work out what your game actually is. Seven questions, about twenty minutes.
This is for you, not for your teacher. Nothing you type leaves this browser, there is no account and nothing is sent anywhere. At the end you get a one page design document you can hand in, print or email to yourself, plus an honest check on the parts you left vague. The check is a set of rules looking for specific words, not a person reading your work, and it will tell you exactly which rule it used.
Show me an answer that works
Your answers are kept in this browser as you type, so a refresh will not lose them. They are not sent anywhere and your teacher cannot see them until you show them.
One page design document
Honesty check
Rules looking for specific words in what you wrote. It cannot tell whether your idea is good. It can tell when you have been vague, and being vague now is what costs you three weeks later.
What to do next
What this check cannot see
It matches words. It does not understand your game, it has never played anything, and it has no taste. If it flagged something you meant on purpose, you are right and it is wrong, and you should be able to say why in one sentence. If you cannot say why in one sentence, it might have a point. Everything it looked for is listed under each flag, so you can check its working rather than trusting it.