I just noticed score is equivalent to your amount of gold. So just need to stick with +4 loots till the end. Beaten the boss twice before noticing, then have to beat him twice again.
A great game, the only complaint I had is the difficulty in getting the achievement, Idle Game. The achievement itself isn't hard; the problem lies on the fact that once you've upgraded other things into level 4 (e.g. theater, cathedral), it will stop building houses but will focus on the higher tier building. Since I unwittingly accomplished all the other achievement before going for this one, I had to reach 1000 spawns with only 33 citizens per day. Which, while manageable, is very time-consuming. Rather than cycling between higher-tier building, the game should build each type, regardless on their tier, of building within certain ratios.
Finally! Medium Badge acquired on May. 18, 2010, Hard Badge acquired on Dec. 17, 2012. A tip for the latter levels; try to move the bridges so that they're moving in cycles/cyclic manner. This allows you to easily swap between pieces which you need. I could imagine an impossible badge where once you've solved the board once, you need to solve it again with a time limit without pausing. That'll be hellish. As a little trivia, it took me around 4 hours with the longest in A-18 :D.
Day 6 of Santa Journal: I fear my time is nigh, even now I could hear the bloody massacre slowly creeping nearer to my abode. As I continue to pen my last will, so is the sound of those ungrateful elves hacking at my door growing stronger until it is heard no more. May the spirit of Christmas last till the end of eternity! Day 7 of Effing Worm Journal: Om nom nom... woot?
I'll admit, decent game worth 4/5. As stated by others, occasional lags deter it from ever achieving 5/5. Other than that, lack of new maps make it redundant. The game ain't very exciting either; perhaps because it's not fast-paced enough. I find myself lazily clicking to shoot my main weapon every few seconds and that's a bad sign for a space battle game. Reduced weapon cooldown and higher thruster speed should help in that sense.
For the hard badge, keep your money to buy the 500$ double starting coin/per kill. Add in the 100% money refund on sale upgrade. Then survive till level 100. It's friggin cool when you survive till that far :D.
Some tips for new players aiming for the badge. Only prioritize one ninja by upgrading it constantly since the combat is a one-on-one format. Try to obtain karma-based weapon while periodically swapping it with stronger ones (remember to sell the one olds for more karma). You can defeat the little girl in your base to obtain a strong weapon which will last till you're around level 10-ish. Try to open up 3 magic slot; 2 for combat magic while 1 should have money giving property. Shortly after you level, there's this temporary 2x EXP duration. Exploit this by defeating an opponent (equal level to you) -> Heal yourself in Hospital -> Rinse and repeat. Your money gained > Money used to heal due to the magic. With this, it shouldn't take long and you don't have to wait for your ninjas to heal. That's it, good luck :D.
 "Qoosh"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "Demons vs Fairyland"){kind=icon}
 "Legend of Pandora"){kind=icon}
 "Farm of Souls"){kind=icon}
 "Icycle"){kind=icon}
 "Scriball"){kind=icon}
 "Ubooly & Friends"){kind=icon}
 "Wooden Path"){kind=icon}
 "Effing Worms - Xmas"){kind=icon}
 "Vorp!"){kind=icon}
 "Clash of the Dragons"){kind=icon}
 "Agony: The Portal"){kind=icon}
 "Thing-Thing Arena 2"){kind=icon}
 "Box Clever Level Pack"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Arkandian Explorer"){kind=icon}
 "Hexagon"){kind=icon}
 "Ninja Warz"){kind=icon}
Yeah! :)