Glad you enjoyed game and I appreciate you sticking through it :)
I agree with you on the in-game map. That was an important feature that I unfortunately didn't have time to add in. I figured it would be challenging without a map so I included a picture of it on the page in case people got lost or frustrated.
Your picture shows the patch of wall on the right that in hindsight I could have put 2 spikes on to make it not possible to pass without double jump and get soft-locked. Play testing definitely help make these things clearer. I think it's also clear from comments that the 7th mask is not easy to find so I would try to make it more visible to the player as they pass through in a post-jam update of the game.
Thanks again for the feedback!