Hi, I've noticed in other jams, that if bugfixes are allowed, they normally ask that you leave the original jam build up during the voting period.
As you seem to be doing a web build and can only have 1 web build active at a time, you could upload the original build as a Windows or other OS build that can be downloaded, or just leave the original zip file up so it can be seen that you've made changes.
If you plan to upload another version, I would recommend explaining on the page or through a post what changes were made between the w versions.