My advice: You can skip some of the launchers, and you shouldn't have to fully upgrade any of them. Upgrade the bat swarms, and when you get a passive upgrade, reset your points so you can pour into them. When I got the last launcher, I made it to the ark without upgrading it, but then had to go back and fight it again, and I needed upgrades to reach it then. Once you get that last launcher, just aim as low as you can, and the bat swarms should easily be able to keep you in the air indefinitely.
I think it would be a great fourth possible ending somehow using the drag and drop cheat to move the three around at the end, but I'm not sure how that would work.
I had a hard time with finesse on insane, mostly because of this buggy compute I'm using, but defense worked great. The dragon wasn't any harder on insane than on easy using defense.
I really don't like that there are four teams, I keep getting cards from the teams I can't use yet, so I haven't been able to upgrade a single card in my deck yet!
If you are having trouble with a big triangle, finish the level first, then go back and get it. Once you get it, hit "return to overworld" from the esc menu and you can keep your triangle without having to finish the level. Great for the triangles on lvl 5 and 11 HM
 "Kick The Critter"){kind=icon}
 "Obliterate Everything 3"){kind=icon}
 "i saw her too, with lasers"){kind=icon}
 "Dragon Age Legends: Remix 01"){kind=icon}
 "Gun Disassembly"){kind=icon}
 "The Valley Rule"){kind=icon}
 "Battalion Commander 2"){kind=icon}
 "War of Omens"){kind=icon}
 "Last Legacy: Null Space"){kind=icon}
 "Robot Wants Ice Cream"){kind=icon}
 "Astrox"){kind=icon}
 "Pixelo"){kind=icon}
 "Decision:Medieval"){kind=icon}
 "Soviet Rocket Giraffe Go Go Go!"){kind=icon}
 "Dungeon Defender"){kind=icon}