Daaaaaaam bruh you got me
At first i was a lil bit confused what's going on but when I figured it out omg bruh that's clever! The intensity is high af when you think about managing your mana and remembering the right combination after that, really juice stuff right here!
I felt like at the end I was using only purple and blue weapons cuz the purple one is op! I think the game would benefit of static enemies (so it was easier to shoot from other weapons)or making everything hostile projectiles cuz i felt like i didn't want to use other weapons cuz the purple one is just really easy to use and it just one shots.
Also have you considered doing to buttons to shoot? like from the right one and the left one? maybe it will kill the balance cuz you would probably always will have a blue one at one side, but I felt like it would be interesting(kinda like in the elder scrolls games lel)
Anyway i didn't expect that, it was really good!