Thanks for your comment, glad you liked the game ^^
At first I made it so you couldn't so easily avoid Yuyuko just by staying at the edge of the screen. Then I realized close to the end that the game required players to predict Yuyuko's movements, and then I made the movements random... Oops! So to make the fight at least manageable, I made it how it is now.
Of course there is always things to add after just 3 days, but I'm happy that what's in there is satisfying ^^