Thanks for playing! :D
I really struggled with communicating what the red/blue provided, but I think most people are figuring it out well enough with some experimentation. Blue bar gives movement speed while hampering proj speed, damage, attack speed, activating it with spacebar gives another speed buff and reduces the speed of nearby enemies. A full blue bar when pressing space will stop all nearby enemies, while a full red bar will stop you in place.
I wanted to add a powerup for making projectiles screenwrap, but time D:
I'd challenge you to push yourself to the boss! 765 is pretty early on still :)