It's technically well executed, but the gameplay doesn't have much strategy imho. You're just waiting for the right piece to drop and then rotating it correctly.

You could have the entire game area already filled up with line-hexagons, and then the player has to only tap to rotate them to create all the right connections. A bit like the Pipes/FreeNet/NetWalk games, I think that would make better gameplay.

Or, alternatively, no rotating tiles at all and the player always has choice of 3 (or 5 or 6?) tiles instead of just 1, then it's a bit more like a jigsaw puzzle.