I'm unsure how many of my issues can be attributed to the lack of delta time, as you've stated in these comments and on Discord. I tried moving the game window to another monitor (my main one's 180hz, I have one that's 60hz) and it didn't change anything but I could be mistaken about how browser games work internally.
In any case--the gameplay loop ended up being staying in the dead center, getting one light show up on the left, waiting a few/several seconds, getting an attack where 3 lights come at me from all directions but left, banish them, collect, wait a couple more seconds, rinse and repeat with the same two attacks. I figure that the attack variety might also be impacted by said delta time bug, and it's a real shame (1) in general! I feel massively for you, as someone who commented out a critical QoL feature in my own game (2) because I like your take on the theme and think this could be a lot of fun if there were more, but slower, lights. If you're planning a patch I will happily revisit after the jam!