I tried the game again on mobile and I was a lot less sick, but I think that has to do with the screen being smaller. I do sometimes get motion sick from some games/movies and it's usually because of camera movement. I think here it was the bobbing/circular motions that got me.
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Wow, thanks for following up! I appreciate it, and that's fair, thanks for the feedback to begin with!
I submitted a bug fix that was keeping the memory usage for sprite alphas on web abnormally high with larger resolutions. I'd say it's about 60% better. Still not as good as the mobile experience, but definitely not unplayable anymore.
Thanks again!