>>> Prompt (this is really just programming)
Given these two lines, make it so that they will only betrue if the sprite is heading in the direction of the wall (you can use this.velX to get velocity):
const hitWallOnLeft = isPixelOneOf(oldImgData, this.x - 1, this.y + this.height / 2, terrainColorBytes);
const hitWallOnRight = isPixelOneOf(oldImgData, this.x + this.width + 1, this.y + this.height / 2, terrainColorBytes);