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Free space is a bingo thing, not about 0xFFs, haha. And poorly inserted MIDIs is actually also a problem for fangames, where they literally just include the .mid files and RMXP uses the default Windows MIDI soundfont instead of proper instruments.
Ah, I see. I actually haven't played any Pokémon fangames, and my GameMaker fangame is just going to use streamed music (like MP3/OGG files) so I just assumed all fangames did something similar lol
custom tiles is not a bad thing, and clashing art styles is already there