As a fellow Godot user and fan, I love to see the engine put to such a good use. The graphics are as retro as it can get, really nice to see a 3D entry following the limitations of this jam, amazing work! I don't know if anyone else reported this problem, but the mouse sensitivity was a bit high for me.
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Try the windows build (if you can and have time), see if the mouse sensitivity is better. For some reason it was a lot higher in the web build than in the windows build and in the editor, so I turned down the sensitivity by half in the web build but I had to submit the game to the jam so I didn't have time to fine tune it.