I've been kind of awful this month so all I have is a quick ROM hack of Gridball, an old game of mine. Instead of a paddle-and-ball game, this is now a Snake-like game very similar to Poing! by Rick Holzgrave, and also very similar to DragBall and, to a lesser extent, TrailblaZer.
Click in front of the moving ball to place a block. The ball will turn 90 degrees at the block depending on the ball's colour. The computer-controlled paddle at the bottom can change the ball's colour if the ball hits it. You can also click on an existing block to remove it.