How to Build a Browser Platformer with Gravity, Tiles, and Jump Feel

A technical guide published on the Sorceress blog outlines how to build a side-view platformer game in the browser using vanilla JavaScript and canvas in a single weekend. The tutorial breaks down the core loop into four stages: input handling, physics integration, axis-split collision resolution, and camera lerping toward the player. Key mechanics covered include coyote time, which lets players jump briefly after walking off a ledge, and jump buffering, which queues a jump press made just before landing. The guide warns that resolving both movement axes in a single pass is a common cause of corner clipping and wall sticking, recommending separate X and Y passes instead. The finished build targets under 700 lines of code and ships as a static HTML file, with Phaser 4 suggested only when motion polish is the primary goal.