calm trellis
Since Ice can create solid ground on water there could be some sections with acid/poisonous water so you have to create ice platforms to get over it instead of swimming or gliding.
I also think there might be huge potential for some more experimental/advanced features regarding ice puzzles.
CrossCode is a really awesome game when it comes to puzzles with elements (combined even with combat) and maybe there could be taken some inspiration from. Here some examples:
Creating platforms with the help of different objects you can move around first (I think thats more interesting instead of just building a path of ice on water from one end to another)
Freeze blocks to make yourself a path (in CrossCode you were also able to rotate manually the triangle blocks to position it right first before freezing. That was necessary to make other projectiles get reflected the right way as seen in the next video).
Here is a lot going on, kinda like the ultimate test for all the features the element has to offer (with the support of the fire element). (better to watch in half speed or so)
Goal is to accompany and support a flying (in slow-mo) projectile and remove all obstacles on the way or change the path.
Of course lots of these things wont fit for glyde but maybe there is some potential to make elemental puzzles more interesting and challenging
rotund summit
pretty good idea/suggestion. tbh would like to see such myself added to the main game.