JazzBall

JezzBall from the Windows 3.1 / 95 days, with walls at any angle.

Drag with a mouse or finger, then release to build a wall. Capture 75% of the board to move on. An atom hitting a growing wall costs a life.

Four difficulty modes, including Relaxed for slower atoms and faster walls.

Also at jazzball.xyz, with home-screen installation and offline play.