Bug reports.

Basically, I'm asking you to fix this: when using teleport without Earth magic on a mirror, the hero jumps to a town on the designated plane instead of the one they are currently on, and I almost lost because of this...

Not "on the designated plane," but "on the surface." In the case of a mirror, this is the plane of the red player.

In general, it would be a good idea to add a feature where, when using teleport without Earth magic, a confirmation window pops up, indicating the castle to which the hero will be teleported, and the option to cancel the teleportation.