Just press the flag to begin the animation. There aren't any other keybindings. I was experimenting a lot which is why there's so much unnecessary code; WIP although it's unlikely I'll finish it.
All images belong to me except for the pixel fire and green lines, which I was too busy to do on my own. The music and sound effects are from Undertale; the character is also from that game. This is my first time doing 2D animation, which is part of my explanation for the poor quality. The colouring style was very quick and simple; usually I put more effort into shading but I was working on a tight schedule to finish this as a class project. I wasn't planning on sharing this, actually, but a few of my classmates wanted me to.