Huh that's a funny one.
First of all, the metal ball thingie, it's awesome! Super creative ability and it flows so well! Props to the level design for that, it was really fun to bounce around with that, I love it!
That said, wow that map is so huuuuuge, and like, in kind of a harmfull way I'm afraid. Every single room kinda just looks exactly like the previous one so after a dozen screen transitions I was already completely lost, and the rooms are soooo big, with not a lot of interesting stuff happening on them before you get the metal form, so like, until then you're just kinda... walking and jumping aimlessly throught a lot of random platforms with an ocasional squirrel here and there. And the metal form was actually the only thing I found AT ALL, I couldn't figure where to go next... I did climb a specific room that require a lot of very cool bounces, but then at the top it was just a dead end lol
In the end I got to a room with very weirdly missplaced coral spikes that had no hitboxes, and fell out into the void when I tried leaving it since aparently it had no transition to the room before it... After that I kinda gave up since walking all the way to the metal upgrade again sounded like a chore, plus I have no clue where on the map it actually is lol, as I said, I was completely lost. (Usually I don't give up that easilly to silly softlocks, but in this case I really have no idea how to navigate this map, it's way too big and empty....)
So yeah, I have no idea if I saw everything I could see or if I literally missed the whole actual game because there's really no indication of progress anywhere, not even the game page gives me any clue, so sorry if anything x)
Next time I'd actually advise to build way less rooms. Say with me folks: Quality over quantity!