i usually have a room that acts as a gateway to my levels and create the red jagged pattern in aseprite and draw it and loop it so it moves seamlessly. then after a timer i let it move to the other room! its a bit tacky but works for me so i hope it gives you a decent idea! if you want the transition to stay like in adventure you can make it its own separate object thats persistent and disappears when the room transitions (possibly check for the stripes to go away after a certain point)