This was an interesting one.
It was a simple concept and you made it true without unneeded clutter, resulting in a rather fun small game. I especially liked your use of particles, those words at the start of every level, and the other areas of polish to place around. It feels finished, which not all Game Jam entries can contest to being.
I would, however, have liked some camera controls. The fact that the player moves adjacently, but the camera is diagonal, was… difficult. The movement also, although fun, felt out of place for the game.
If this wasn’t a puzzle platformer, I would have liked the floating movement. However, as this is a puzzle platformer, I must say that precise platforming is much more valuable than icey movement.
90% of my deaths were due to those two things: camera and icey movement. However, that may just be a problem with me. You did have a death indicator at the end, so perhaps all of that was intention game design on your part?
The magenta block’s only purpose seems to be to confuse the player, too. That’s a game mechanic that I don’t like. After all, confusion is not difficult. Confusing is just increasing the player’s learning curve. In my opinion, I think games should aim to decrease the learning curve as much as possible.
With the risk of sounding arrogant, perhaps making it so you can see the outlines of the magenta during building mode, but not in play mode, would improve things? I would say that, since your levels are short, it shouldn’t be too burdensome on the player’s memory while still enacting a bit of artificial challenge.
Also, a small nitpick, that magenta color hurt my eyes.
Anyway, great job! As I said, you made a fun product. Thank you for sharing.