I put about an hour and a half into this game tonight. I beat my first boss--a giant cow with a skull for a head. After he bit the dust my townsfolk had a festival to celebrate--everyone danced around in cow skulls and sang songs. It was cute.
The game is great fun. If you like Pikmin you'll like this game. It's as simple as that. I imagine it shares a lot in common with My Life As A King, but since I haven't played that game I can't say for sure. You have individual citizens that you assign jobs to (farmer, soldier, carpenter, etc.) Each class has its own strengths and weaknesses. They can change jobs at any point (at least so far) but you still need to plan who you're taking with you into the world when you explore.
Oddly enough, the game has some ties to Animal Crossing, too. Every citizen has a name and a unique personality. They seem to be living their lives independent of me. They don't just stand around waiting for me to order them around. The farmers harvest carrots; the soldiers patrol my kingdom; the townsfolk talk amongst themselves. I get a briefing every morning about what's going on in my kingdom--I recently learned that Lily and Josh are falling in love!
The first 5 days were mostly linear, but it seems I've opened up some options now. Whereas before I could had one building I could construct at a time I now have several options--I can create a workshop so I can get carpenters, I can build fancy houses to attract more citizens, or I can get a power up to allow me to lead extra citizens at any one time. A huge chuck of world just opened up and I'm at a bit of a loss where I want to explore first. Additionally, I just built a suggestion box where my loyal subject can leave me notes. They open up goal-oriented quests where I need to defeat bosses and such.
One huge gripe: I can't believe there aren't pointer controls!! Such a let down! What a missed opportunity! That said, the game controls mostly fine without them. I can generally aim my citizens where I want them to go on the first try, and even when I don't, it's not that big of a deal. But it just seems like they're missing the point of the Wii. I wonder if it's because they plan to port the game to another system.
Regardless, you need to play this game. If you liked Pikmin you'll like this game. (It's as simple as that.)