Your games web page starts with "Same controls as my past games.". As someone who has not played your past games, I have no idea what those controls are. You should make each game page standalone with all the info players need for it. Many people aren't going to want to go looking through other projects to find the controls. I am writing this before playing, so maybe the controls are shown in game, but his is my first reaction to seeing that text.
Upon starting there is text that says "Press X or / to FREEZE!". Pressing either button does nothing. No other controls are mentioned. Your game pages mentions the "cool move" can only be done in the air, so I jumped and pressed X, and it did something. I would suggest adding some text with the basic controls above the start, along with updating the exiting text to "Press X or / while in the air to FREEZE!", or something similar making it clear it only works while jumping/in the air.
The mechanic of maintaining your height and gliding across, almost like an air dash, is something I have seen in plenty of platformer games and can be part of a fun game. I'm not sure if I'd enjoy a game with that being the only/core move, but as part of a normal set of platformer moves it is nice to have, especially as something you unlock as you play. I often associate air dash alongside double jump as good companion abilities. You implementation seems to work fine. I tried it several times and was not able to make it to the flag over the ice, but I see that there is just a cliff after that, so it looks like even if I did make it, it would be the end anyway. The general movement also feels decent, from what I can test in the small area. There would need to be more to the level to really get a good feel for how it works with the level design, as that can have an impact on how good everything feels as a whole.