This idea has entered my mind time and time again.
What I'm thinking of is along the lines of Final Fantasy: Darklord on WiiWare. With maybe a couple of elements of Badman and Dungeon Keeper 2.
I'm truly convinced that this idea could work.
For example, let's say you have a room with 4 squares.
In those four squares you could put in 4 Slig rookies.
Let's say that 4 equivalents of Abe show up, those Slig rookies are in trouble.
Instead, imagine if the player puts in three Big Bro Sligs and a chant orb. No chanting will make it much more difficult for the Mudokons. But Big Bros will be expensive, so they can't be placed on every possible square. Corners will have to be cut somewhere
Different units would cost different amounts of money. Glukkons would take up a square on the room, but would allow the factory to make more profit. But if the mudokons get to them, the Glukkons will be wiped out. Think of it like a dungeon in a typical RPG. You don't want the Mudokons to reach the treasure at the end, so you'll put obstacles in their way.
What I'm suggesting is a careful balancing act between money, profit and security. I think that a reasonably simple, but yet addictive game could work. I'm thinking Diner Dash meets Tower Defense.
Anyone with me? (This will be in Flash btw).
PS I can have a prototype running in a few days time. The more comments I recieve, the better my game will be.