Should we teleport the player upon entering the portal instead when the player tries to leave it?

Would give a more "portal" like feeling.

Maybe also usefull for #32

Yep, seems so.

Pretty sure its already made to work like that, at least when the move event listener mode is used. (When the polling is used it just depends on the player position and whether or not they are in the portal at the poll time)

EDIT: Actually I think I see where the issue with the listener is: It uses the player's position to get the portal instead of the position that they move into.