Interesting concept. I would have used different colours for the pieces based on what I think is the closest equivalent to regular piece colour in terms of vibe, although I agree with orange and yellow. Cyan piece I would have made purple. Red, I would have chosen cyan. The grey/blue I would have made a dark blue.
I was struggling to do the equivalent of a t-spin because the lock delay isn't long enough when soft dropping, it feels instant. If you wanted it to fall instantly and lock instantly, then you should have added a hard drop button.
Well done, it's a good little prototype!