That it be playable with 1 meg chipram
I second this! I'd love to have a new Amiga RTS game that runs on the real hardware, and there's certainly no need for the game to require more colours or a higher resolution than an OCS Amiga can handle. Since this is a small one-man project (at least for now) it would be smart to keep it simple, not trying to add too many advanced features right off. Even he level of complexity of something like the first Warcraft game would be more than welcome to the Amiga platform.
Check this out for example, this artist pixelled a whole set of graphics for a 16 colour RTS game and nothing ever seemed to come about from it, perhaps you could team up and build the game that he was designing here:
http://www.wayofthepixel.net/pixelation/index.php?topic=10001.0If you want to see what kind of RTS a 1MB Amiga is capable of other than Dune 2, download this abandoned example game:
http://aminet.net/package/game/strat/battlecraft