Thanks for the tip and nudge here. I gave it another shot in full screen mode and I made it all the way to the last challenge! I really loved the animation audio and how y'all were able to apply your puzzle mechanics here in such unique and interesting ways!
We gotta talk about the collision detection though. There were too many cases where I got close to an edge and then fell off even when it looked like I was still on solid ground. I think making the player's collision shape for those smaller would really go a long way towards making the game feel more fair. The opening/closing holes made for a unique puzzle mechanic, but the collision detection starting on the initial frame of the opening animation meant you lost the ability to telegraph to the player that it was about to happen and it led to a lot of frustrating moments because of the first collision issue where I'd be swept away before the hole was even halfway open. I also found myself having to pay a lot of attention to these specific holes because the main floor tile color was also black in the center. I think the timed holes would have stood out more if you'd made the main floor colored or use a pattern so there was more visual contrast between them.
Thanks for making and sharing your game—this was great!