Did you try the windows version? The browser version doesn't run nearly as well, probably because I went heavy on the shaders and particle effects.
If it was the windows version that's more concerning .
I tested it on my 10 year old laptop (intel i7-5500U dual core 2.4GHz) and I was getting over 120fps without any issues, but it was laggy on the browser. I did put a warning under the web version, but I included it anyway since I think most people should be able to run it even with the performance loss.
Please let me know! Would be really helpful feedback