A fun puzzle game! It feels very original, I like the mechanics. There's quite a lot of complexity in swapping and removing letters, that can make the game fairly challenging, but arguably that's a good thing for a puzzle game - as long as the players actually know the words, which is always a difficult balancing act for word games. I like it!
As a side note: I think you disabled scaling, which makes this game unfortunately a bit small on bigger screens, it's probably a good idea to enable that.