Thank you for trying it, I didn't know how to also put it to download so that they could try it in the same way as we did when we did it, if you can tell us how, I would appreciate it, as it is important and we can apply it later.
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So with the browser version if nothing is visible when pressing Run game, then we need to open fullscreen mode so it can appear. You can enable a fullscreen button on the itch io settings.
When I start the game I had to press Escape two times to see the cursor on the browser, I believe by default the game locks the cursor in the code, so the bug might be coming from there.
I think in one try I pressed Ctrl and it made me see the game camera properly as well, but not too sure.
I hope this helps you find the problem!