Good game from a precision platformer standpoint with creative mechanics. From a puzzle solving perspective, in the last couple of levels it seemed like I was probably not solving them the way you intended at the end and was exploiting the block jumping mechanic you mention in the author comments (and have an example of in the video) which gets very easy when you have the freezing ability. At least for the final levels, if you don't want people to be able to do that as a cheesy way to win, then maybe have the goals on floating platforms instead of tops of cliffs.
If you do make any updates, it looks like this was made in Unity, so hopefully you're either not using PlayerPrefs for save data or you've implemented this to prevent saves from being lost on update: https://3p0ch.newgrounds.com/news/post/1086279