In Inago Rage, players battle hundreds of mechanized enemies at once, donning rocket boots to fight both on the ground and in the air. The game offers 50 frenetic levels, which take place on city rooftops, above gas giants, and in deep space. As players progress, a storyline illustrated in graphic novel format introduces them to elements used in the game's building stage.

Inago Rage allows all gamers to create their own levels, a process once reserved for professional developers and technically proficient mod creators. An integrated arena designer makes building easy with its simple drag-and-drop interface. Players construct levels by arranging architectural elements such as platforms, towers, and skyscapers. They then place markers where enemies and power-ups will appear. Special effects are created through a graphical interface, allowing players to simulate everything from a calm day on an alien world to a storm-charged nebula above a black hole.

Players build in real-time, allowing them to test their creations simply by switching from "build" to "play" mode. The game stores levels in individual files, which are compact enough to be traded in forums or via e-mail.