So there is a problem in the 4th level where the boxes are too far apart to get over the large "lava lake". Its doable when you have 2 hearts left and use the damage knockback at the second jump with the fire character to get over it. Also you can jump inside of the horizontal walls of the character type, so you can jump inside the water with the water character. It was not intentional to solve the level like that but its really fun and challenging to do it. Me and my friends have kind of a bet who can get to the end first. Maybe you can do it too, but be aware that its not doable in the normal way :/ Might look into that when the jam is over :)