Here are some very specific action points for your project though:
1. Please move all your TO-DOs etc to Issues page, your README must talk about your game, any relevant documentation, installation steps, contribution process etc.
2. Comment your code exhaustively.
3. Add design documentation, which describes in detail your game design, host it on readthedocs and link it to your README. That is one way to clearly highlight both your communication and design skills.
4. I am not sure if you have shipped to iOS store, if not ship it. If you have already done so, apologies for my oversight.
5. Have a separate github.io website just as your game's home page, with download buttons for the app store. Have a reverse link to your GH repo as well on that page.
Now take the above and add a cover letter which describes your motivation to make the game, the fact that you shipped it and what you can contribute to as a developer through this experience; but don't be verbose. Be specific in terms of contributions you can make, that will need you to study the company and the job you are applying to and it will reflect in the cover letter.
I would strongly recommend you apply to game studios where your skills will be relevant. I am not sure if those TO-DO list and other bakery maker nonsense app makers are anyways going to value your skill, the ROI is too low to even bother.
Please check the past 6 month HN Who's hiring threads, for job postings from game studios or something relevant. Ex: Many times there are positions like asset pipeline developers where someone who has shipped a game end to end is a great fit.
I think you need to course correct, else you will keep seeing the same results. Wish you the best.