For the impossible badge, actually, you only have to play through some times and learn very well how the single bosses can be defeated without taking any hit; it's not that difficult. Maybe, since the spider boss is the easiest of the lot, you should restart until you get it in order to have a bonus round. The other monsters aren't that difficult; for the cactus you have to kill all the small cactuses and keep in the left or right high sides when he shoots. For the spaceship you can use the bomb to kill the four droids that heal it. When you have your own strategy, you'll get the medal ;).
Just got the hard badge. There is a strategy, actually: accumulate in the first 8-10 levels one of these two combos in every level you can:
- every shape 4 times
- every colour 4 times
You would then start building bonuses that you will use in the last 15 levels. Good luck ;)
This actually would be an awesome game, if only someone would have liked to change some little issues.. save function, checkpoints - please Kongregate someone fix this!
Only one thing: it should not be compulsory to select the enemy you want to attack when:
1- the attack hits all the enemies;
2- there is only one enemy left.
In order to beat the last 5-6 levels you must NOT buy the expensive $30,000 upgrade. Rather, buy all the other upgrades and improve equally the four things on the low left side. Even the Cinnamon Paint Job isn't useful, you should maybe only keep two Emergency Repair Kits just in case.
The game is awesome, but actually I think that there should be some guide about the classes and the cards you will receive in-game (Chaos, Death and so on).
In order to obtain gold medals in the last levels, the Elementals are fundamental. As P3DaPro said, the best combination to use is 8-5-9-4 9-7-7-7 4-7-7-7. I found it very difficult to overcome the last levels using only Turtles, Golems and Healers.