Tripong Groovy
Not a bad variation on Pong, and stylistically has a touch of games like Rez and that line game with the rabbit ... I like the physics and the bounciness of it, very fun, but I found it difficult to beat the computer! It's much harder to predict how your paddle will interact with the 'ball', but that's what makes it so special! But, yes, sound is a must. Add some really funky music and you'll have an addictive game there. Make a version with more backgrounds, cool music and sound effects, and everyone'll have it.
