Thanks for the feedback!
This is intended idea, you have to either kill enemies as they spawn 1 by 1 rapidly or isolate them with a stun, otherwise they overwhelm you. If not for that, the game would be just about mindless circle strafing.
The game also designed to be fair in that sense - enemies never spawn in one huge group (3 is the most which is the highest amount you can loop in a single go), and also even in case you messed up there's always a way to outplay mechanically with the hitbox of main character being very small and also enemies can't get too close to each other, always leaving room to strafe between them :)