Very cool split mechanic and nicely designed levels around that mechanic. I really liked how I had to figure out when to split and when to rejoin based on the level design. Although it would've been cool if I could choose whether to rejoin with the back-half or the front-half, that would open up so many more level design and traversal options. I really like the art style and Millie fits perfectly in that vibe, but I wish there was more sound fx for jump, split, rejoin, etc.
Awesome job...keep it up!