Wow, super solid entry. Well done!
I appreciate the more straightforward, mechanical approach to the theme of having to kill enemies twice, effectively. This felt like playing two bullet hells at once which was certainly a unique take on the genre. Everything felt pretty good and that lightning animation/sfx/ability was top notch. I just sat there in the tutorial casting lightning because it felt great. If anything, I think making your fireball have the option to be held down instead of clicking repeatedly would make this a bit more user friendly. My finger got tired very quickly as the difficulty ramped up. Any game that asks the player to repeatedly and quickly make the same input should ask if an accessibility issue might come up for rapid button presses. Something to think about for future jams!
Congrats on making such a polished entry. And that mouse character is pretty cute. :)