Great job on the game! Nice minimalistic visuals and calming music. One use keys huh... It really messes with the mind. Not much of a puzzle fan, but I can definitely appreciate this.
It's so awful when the text prompts for wasd disappear, haha (I hate it, but I really love it). Playing till the end, my fingers just start tracing the WASD on my keyboard constantly to try and assign which new key it is on the UI on the bottom.
Standard sliding ice and falling platforms, but the Opposite Tiles were a real twister, since the keys change on each press as well, it really messes with my head, in a very good way, it caught me at the last moment in one of the levels. I really like it, mind bending, but not incomprehensible and just takes a bit of understanding of the logic behind it.
It surprised me that I not only had to get myself over to the goal, I had to do it with precisely 0 moves remaining. A few levels had me reaching the goal and then hopping back and forth until the last move mark, which was probably a bit of an exploit, but it being a puzzle game in this fashion, it'll be hard to iron out everything, rather, I'm grateful for the option to hop back and forth, haha.
I do wish restarts were a little bit faster, it's not like they're slow, but it just takes that bit too long to count as fast enough.
Great job on the game!