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Making the player think about more things at once is something I'm actively trying to avoid at this point, because in the very near future I intend to add more diverse and complicated sets of things to avoid.  Once all the enemies are in the game, I'll think about adding this or other mechanics that make the shooting less "simple." 

(The same goes for limited ammo, shot charging, overheating, weapon swapping, weapon pickups, weapon upgrades, cooldowns, literally anything that makes the shooting more complicated than the simple spray-and-pray affair it is right now.)