Cyberkast is a multiplayer free-for-all and dueling game, aimed at groups of 2-6 players wishing to have some seriously chaotic fun. Genre-wise, it combines elements of arcanoid, billiard, pong and even a tint of tower defense or strategy, resulting in a mix of arcadey and logical goodness. Flavour-wise, it's about deep space duels of cybernetically enhanced transhumans whose control over time, matter and energy has started to resemble sorcery.
White squares (well, they're not supposed to be white, it's a bug - visuals are heavily WIP at the moment) are Energy Barriers - basically, walls. A very basic spell, meant for protection of your more valuable assets.
Like the balls behind them - Fusion Nodes. It's an economical spell, an energy generator of sorts - you pop it and it starts to replenish your energy slowly, but steadily. One warning is that they are volatile and, when destroyed, produce a strong explosion.