Thanks! Yeah, the clownfish and pufferfish level actually happened by accident. I ran into it during playtesting too and thought "heeeey, that was fun" so I left it in xD I'm happy you got to experience that too.
Not sure if that happened in your playthrough, but sometimes it also goes into that perpetual motion for a bit right at the end. I think it's the fishing rods + spikes combo that causes it.
As for the frame drops, I think the web build might be a bit less performant, so that definitely doesn't help :D but I'll try to optimize it better for web next time