This is a very cute number puzzle game! I agree with the other comments that the difficulty ramps up too much too fast, but that's very par for the course for a jam game without lots of time for balancing! I do have a hard time following the split and merge mechanic intuitively. I think adding some sort of animation or slower step-by-step process of each move at least in the beginning would help me understand the logic behind each movement. Overall, great work!