Yeah, so regarding moving in the loading screen, is not a problem that the player can do that but more in the sense that it affects gameplay because your location changes and is not reset when you reach another level, so if you are at the right edge of the screen you will be too close to the enemies when the loading ends, it's just something to keep in mind, I don't think the loading screen is long but if you are conflicted about it you could shorten just a little bit of it.
I'm glad my feedback helped you!