The combination with the physics system is quite interesting, but I'm not sure if it's due to my computer's hardware or not. As the number of characters on the screen increases, I encounter noticeable frame rate drops that significantly affect the gaming experience.
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Totally, this definitely seems to be hardware dependent, and possibly browser dependent too. Thanks for your feedback.
I've tested this on a few different devices, safari browser and some other devices seem to struggle. I'm guessing it's because I'm leaning heavy into canvas filtering which I think may be the bottleneck here. I'm using the canvas filtering to color/recolor a lot of things so could be fixed if I took the time to create the new sprites instead of recolor them the way that I'm doing.