Sometimes a bit hard to see what’s going on with the rainbow background. Without Lumines’s time line I found it a bit hard to consistently make combos but maybe I’m just a smooth brain.
Controls could do with some tweaking: moving and rotating with the arrow keys is a one-way trip to RSI, and I don’t know what “follow piece” does as pressing tab on a web game makes it lose focus.
Otherwise, I really enjoyed it! Just needs some catchy music and sound effects to really up the addictiveness.