There is one fundamental flaw with your picking of/on my game: it's been released a decado ago (actually 11 years), not it will be released within few months years from now on...
That is the point: we are not some zealots pretending to be stuck in a gravity hole "where time stood still"
Anyone seeking that can find it on other miggy forums out there.
We are into nostalgia, progression, cool stuff, but not continuing where we left off a decade ago.
You can come up with a better game design then what was possible a decado ago - no matter who did it - simply because here you are not restricted by finanical, management, deadline and mass market considerations.
btw: do a "where time stood still" (I did not say Cadaver, because the bmaps will kill you and the project) style isometric arcade/adventure at least speed won't be an issue unless the programmer is really stupid