Thank you for the in-depth feedback!
This is the first time we tackled this many particles on screen for a game so I'll definitely look into what you said about slowing down the steps, I agree that it would be better than having your game entirely frozen.
There are particle containers that we've used before in previous games that could help remedy this, but they do take a bit of setup, so on account of my laziness we ended up getting particle spams instead.
The immortality bug is something that I unfortunately wasn't able to run during testing so it ended up ruining the experience a bit when players got too strong, however I'll definitely be fixing that after the jam.