Rather than make it similar to Tetris, you should make the game look unique. The truth is more than a Tetris, it seems to me a very good idea for a puzzle game without being even close to Tetris, I don't know if you do it for a hobby But it really looks great and entertaining. You could make several games out of this and sell them to Sony and other companies.
I just think you could look into creating similar pieces so you don't have a problem with it but I really don't see Setris as a tetris clone with variations to me it looks like a real new puzzle game
It would be great to see a game like puyo puyo tetris later but with this game included
forgive so many fantasies but I think this game has a very good potential to recognize it
I am also making a puzzle game but it is quite rare it is still only in lines of blocks but I can share it soon