This game reminded me a lot of some Flash era platforming games, which was a pleasant surprise given my experience with some of them. The gameplay itself felt generally smooth, and I liked how the custom cursors added to it! The only issue there was how Daiyousei risks unexpectedly turning when she's close to Cirno, due to where the click actually goes compared to the graphic. It was a minor issue and easy to avoid, however.
In fact, I liked the graphics overall! It was fun to discover their actual functional use as I went as well. I would be curious about a cheery emotion on the Daiyousei cursor when clearing a level, but enjoyed what was there. Everything was readable easily, which also helped.
The music could do with some more layers / instruments. I did enjoy what I heard of it, however.
Overall, the levels turned out to have some good puzzle potential, and there's good writing that was built right into the game, so I enjoyed it!