You may not know this, but there were actually a few mechanics that had a lot of depth built into them that most players never tried to explore.
Mainly though, I am talking about the "crawl" mechanic. Crawling in this game is really REALLY OP. A lot of the otherwise really tricky encounters can be a relative cake walk if you're crawling. It makes it harder for enemies to see you, and they can't hear you since you stop making footsteps. But also, you can use it to avoid projectiles because you can crawl behind bumpy terrain for a shield. On the other hand, we have mechanics like the Jump-Attack. I personally have come to feel like it was a mistake to put that in wings of glass because it seems to distract players from the actual solutions to some puzzles as they try to Jump-Attack up and around their problems. I don't mind that most people didn't ever fully figure out how the dive and roll mechanic work, since unlike the sneak, some people did wind up using it.
Another set of mechanics was the snap camera and Zoom. If you touch the D-Pad the camera will snap to the corresponding side of you or zoom in and out. I have never seen anybody use them, but they are they if you want to get a better look at Mayfly.
I was just thinking of little things that could be changed when I get back to it. Here are some of my ideas.
1) Easy Mode: the only difference is that this would give you a TLoZOoT like HUD which tells you what all the buttons do at any given state that Mayfly is in, as well as feature your stamina and HP as bars.
2) Change the jump attack so that it is a horizontal slash that does not affect your altitude, but lets Mayfly still be able to grab ledges.
3) Horizontal ledge climbing: Make it to where if you move the control stick while on a ledge, Mayfly will climb around the ledge in that direction.
I especially think that climbing/hanging animations could be enhanced if Mayfly is flapping her wings. In fact I have a few ideas for climbing animations based on how players played such as:
being able to climb up poles and trees, the addition of ladders in the factory and maybe on/in Mayfly's house. Maybe even being able to climb up ANY surface similar to TLoZBoTW.
4) Perhaps instead of crawling the command could be used to preform a TLoZ like roll dodge.
5) D-pad???? Perhaps it could just be used for bonus features like opening a little menu that lets you give Mayfly little emotes, or perhapse a mode that lets you use it to aim Mayfly's head to improve your photography.
Anyone have thoughts on this, leave a comment, I'd love to read them!