This was interesting! I liked the concept of blocks reacting to your rotation, in practice I found it really difficult to manage their different behaviors on top of the inversed Tetris idea; as a lot of Tetris strategies and moves can't apply when the tetromino's can't be rotated. Upping the spawn rate of blocks and making the inital square a bit smaller might improve the pacing a bit as well.
You definitely got the concept across and it fits the theme of the jam well, great work!