Thanks for playing! This is unfortunately and issue with the web build. We have learned that this version of godot frequently has issues with lagging during scene changes. We strongly recommend playing the desktop version.
Yes I noticed as well. You should still probably use godot 3 until 4 is more stable. Consider that for jams almost everybody prefers trying the web version than the desktop one.
Yes, we used 3.5 but didn't get the export settings quite right for Web. But yeah I actually have data from a past jam showing the importance of web builds.