Thanks :)
I also noticed the other entry similar to mine :)
For lane, I had the idea of implementing shape per lane. So, player need to match shapes in all lanes to progress further.
You can see the Future comments in description. Medium difficulty will have 2 lanes, and user will have to match shapes in both lanes to progress. Likewise Hard will have 3 lanes and Expert 4 lanes.
Within the time, I could only implement the Easy part :)