but, 95% of CPU ;/ on my A64 3500+
Well, i suppose that while you're playing you're 100% on the game so
i don't care how much cpu it takes

How did you puted all res inside de exe
and what are you using for rendering and sound effects?
DelphiX/unDelphiX (actually a custom modified version of the last unDelphiX)
does the job very well