It sounds very much like the making of this game was a terrible ordeal. But you pulled through to the finish line, and have created a splendid tribute to PT. Congratulations on a job well done, and for goodness sake stop kicking yourself! You did in fact "earn it" (attention) by putting in the hours of work! Who else?
Recharge your batteries, but don't wait too, long as the spotlight doesn't last forever! (Although you could probably jump-start attention again by re-releasing Hyper PT finished later).
Don't be discouraged from doing Hyper card projects in the future, as you have done (probably) the hardest part as of now; figuring out the software tools. I for one would be interested in seeing different horror stories in the future presented in this medium.
Anything 80's has been hot for a good while, and appealing to the nostalgia of people who were there, or those who still enjoy the products of the time, often pays off.
Good luck with whatever you choose to do. I'll be watching my feed. Stay safe and COVID-19 free.