The idea for your game is really great. I like especially the dramatic but funny ending. I feel the progression is slow at start and a little to quick from mid to end. I don't know how it is programmed, i guess you let the radius of the ball grow in fixed steps, maybe it helps if you instead let the volume grow in fixed steps and calculate the radius using V = 4/3 * r³ * pi. Nevertheless good work, nice 3D graphics. Did you worked alone?