It did this when you choose Main Menu after you lose then you exit out of the menu.
Ahhhh, now I understand.
I see it now - I meant to set this option to Return to Title, not Menu...it was meant to be a Game Over basically, as you said would make sense.
I was so busy testing the Fight Again option to make sure it worked properly that I overlooked testing the alternative.
Thanks for catching that!
In case you continue to have trouble beating the fight, here are some tips that will enable you to win even without the Omega Potion:
Wave 1: Just use regular attacks, very easy.
Wave 2- Slippery Slimes: Just use regular attacks, and Marsha's Zapper.
^ doing this should leave you with plenty of Mana to heal and use spells/specials in the next two waves:
EDIT: I'm gonna remove the second half of this, let folk decide how to approach it themselves :)