As of rightnow there are 149958 steam keys for Ionball. Just go and do the usual email thing for a free game. It's actually a pretty fun game--very fast paced mouse action.
https://www.indiegala.com/extra
About This Game
IonBall 2: Ionstorm is an arcade game with a modern 3D twist; re-live the joys and frustrations (in equal measure) of classics games such as Breakout and Arkanoid, in a no holds barred fast action game with stunning 3D environments, awesome effects and a thumping soundtrack.