Indie developer Arcen Games has put its highly varied catalogue on sale on Steam. Save 75% this week on Shattered Haven; A Valley Without Wind 1 & 2 Pack; Tidalis; AI War; all four AI War expansions; the AI War Alien Bundle; and all bundles. There’s probably something for everyone but shooter fans in there; get in before April 22 to capitalise. In addition, AI War is part of the GamersGate’s IndieFort Spring Bundle. Arcen Games told us that the sale and bundle are important because the team has already moved on to two new projects – Skyward Collapse and Exodus of the Machine.