Press Right Arrow to accelerate (or rotate counter-clockwise in the air). Press Left Arrow to brake (or rotate clockwise in the air). I finally got round to playing that Hill Climb Racing 2 game (Yeah I know... it's been around for years! *grin*). It was rather fun, so I thought I'd start to put together some scripts to emulate it a bit!
Credit to Fingersoft for the sprites and @griffpatch for the original project.