I don't think it's going to anywhere as popular as 2048. zero's "oh crap I clicked the wrong number ruining my 30+ chain just because I wasn't paying attention for a second" is much more frustrating and more common than 2048's "I filled up 3 rows so I have to take a chance breaking my 1024-512-256-128 row" :P

The "click separate circle to start a new chain" seems a bit risky - when I play the game on my phone, dragging/swiping tends to skip numbers. I'll try implementing the "clear selection" button suggested by the other commenter first.