This is a game that hides everything that isn't really essential to the game (stuff like the score and pause menu). I am not a good artist, so don't judge my artwork. The instructions should be logged to the debugger, but just in case: Press space to launch the rocket (this only needs to be done once) Left and right arrow keys to move your rocket horizontally! Press F when the (F) symbol appears on the bottom left corner to increase your fuel. Less fuel = less speed = gravity will make you fall down. Your score will be logged in the debugger, as well as the remaining amount of fuel left.
You have to go inside the editor, then press on the >_ symbol if that appears. If it doesn't, then go to nono word and enable the "Debugger" addon (make sure to toggle "Clear logs on green flag" while you're there)