Keyboard: A/D or ←/→ to move, W/Space/↑ to jump. Mobile: Bottom buttons.
Attack: Drag the aiming arrow next to the character to adjust direction and power; click the "Fire" button to launch (long-press to fire without charging).
Current version: Go/WASM + Box2D (approx.) + WebGL2 rendering. The focus is on performance and framework viability first, with 1:1 behavioral details to be implemented gradually.