Tip: Take advantage of easy to install Patches in your hack. The No More Sprite Tile Limits or SA-1 patches should be considered if you're encountering glitches where Mario and/or sprites are turning invisible.
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Details for Super Mario World 3 - A whole new world
As the person who moderated this hack, I'd like to echo the Rafael's post below about the Bowser being entirely unreasonable - technically RTA viable but having to do the second half of the castle every single time for an attempt is not great.
Many levels were designed at the height in which the vanilla camera goes moves up or down, making the camera very swing-y feeling and didn't do wonders for visual accessibility (especially with certain backgrounds that you chose). It bothered me and some folks that were watching my stream of the moderation. Please look into making your hacks more visually accessible in the future, as I suggested on your first hack.