(Btw, like another reviewer, this game can be beaten within a day. Unlike their other titles.)
It does have replay value. A smidgeon of interest will want you to believe the next play around would be better. Sadly, it is not.
Another simulation this time of a lesser stellar space-battle unlike astro (humorless story.) where you build an army of kairobots in hopes of saving the galaxy from wairobot. Afterwards, once you beat him, you get access to an extremely hard 'special area' that will likely force you to quit playing before you beat each area. (Rewards nothing. Even the planet treasures are the same!)
However, still fun to be had for kairosoft loyalists. (New comers check out titles like gamedev, sushi spinnery, , hotspring , dungeon village💘, cafeteria nipponica, racecar, soccer) in this order. I've purchased every game by kairosoft , beat all of them, and those are my fav's to suggest.
Even raising all the civilizations to max level means little end game. When monsters hit you for like 5k-12k damage a hit (destroys about 50-80 bots), sort of gives you the idea that defeat is close by. (Who knows what the formula for dodge in this game is? Certainly no defense!)