The characters and swapping system are pretty cool, and I like the variety of monsters. The characters and backstory theme made me think of Zombies Ate My Neighbors. I was able to run through with Sarah to round up enemies, then burn through them with Molly which was surprisingly manageable, maybe because it hit many at once. If this was unintended, maybe the monsters could have a smaller boundary just for the purpose of spacing them out amongst themselves. I know the timeframe for the jam was short and it's a lot of art, but what you have looks really good and I hope you continue to expand on the game!
-Scott