The controls are sorta janky, there's no music and the keyboard controls don't work in the Newgrounds version. But it's still lumines and it's a really good formula, so I think you can make it work.
To improve the controls besides fixing keyboard compatibility in Newgrounds I would add in a second rotate button for rotating counterclockwise. Playing the itch.io version I think the rotate buttons should've been z and x over up.
While it is impressive how many things you ported this game into, I wish it controlled better.