Cool concept, with many mechanics like that, it seems like it could lead to fun gameplay, had there been more time. In fact, the first level is already pretty fun, albeit quite simple. As for the second level... well, you can just place Mayumi last on the platform slightly above the star, without needing to interact with anything else in the level.

Pretty short, but has cool mechanics. The music track is incredible! Is there a link to listen to it?

Looks rudimentary but has a lot of elements in play. Was confused when seeing a repeat level, but overall I can see how it can be fun if the levels are arranged more thoughtfully!