Really interesting mechanic, now that you brought Tetris to the platforming realm, I guess the only thing left is to bring platforming to Tetris ;)
For real though, not only is the game incredibly inventive, but a lot of depth is explored through the level design, without making the mechanic feel like a throw-away gimmick. The mood is also really on point, so I would legitimately wouldn't mind a full fledged release. Even if what is here mechanically is already enough to sell the idea, there is always room for more I think!