Thanks for the feedback!
Where did you go off the map? I have bushes set up around the border for that reason, so I must have missed a spot.
I understand about there not being too many different enemy types. A full version of the game would definitely need a lot more different enemies, for sure!
About the auras: right now, they only scale on damage and radius. Is this what you mean? Were you expecting, for instance, the bitumen fire to set things on fire to differentiate it from other auras?