last boss is super easy. Use the most expensive armour, the slow one and keep doing headshots when he carries the bow. Switch to a conventional weapon if he gets close, but if you practice your headshots, its a peace of cake.
Remember to duck under his arrows!
How to do Survival Mode
1. Buy 2 Cruisers
2. Hide cruisers inside mothership
3. Buy a Repair drone/control and hide inside mothership
4. Research all upgrades
5. By the time you are dead, you have way more than enough points for card
Yeah Game stats glitch. Basically, you can equip tons of stuff by dropping a item on the options screen. Game will equip you the item regardless so you can fit 100's of items
Ok here is how you win Lvl8.
Start by building Nautural gas and lab. Upgrade natural gas and then build farm factory and mines. The upgraded natural gas gives TONS of energy and by day 2-3 you will run out of gas so make sure you have UPGRADED geothermals. have lots of mines so you can spam TONS of guns.
Ending is pretty okish.
 "Protector"){kind=icon}
 "Arcane"){kind=icon}
 "rotaZion"){kind=icon}
 "Drone Wars"){kind=icon}
 "Doeo"){kind=icon}
 "SHIFT 2"){kind=icon}
 "Sonny"){kind=icon}
 "Super Energy Apocalypse"){kind=icon}