I've been asking for a sqrxz port ever since the game was announced, but I only got a reply that Slaanesh - the guy responsible for a dingux port of Giana's Return, an other game by the same team - was also "contracted" for sqrxz. The problem was he had no time to work on it and he generally disappeared from the scene. I wouldn't be surprised if the sqrxz port is still pending. Although now the authors could perhaps "contract" someone else to do it.
BTW, there's also sqrxz 2 which uses the same codebase.