Hey, Tetris DS had a similar minigame (the one with 8-bit Samus in the background), thanks for the nostalgia trip!
But, since I played it, I am a bit biased as I've seen what a similar concept can do once fully expanded...
Still, "Tetris but you're the floor in 2D" is a great concept, and the different types of block make it stand out, so good job! ^^