all you need is enough starting money to build a poison tower at the beginning of the track and a super tower later, this combination, along with adding super towers as you get enough money to build more, will win you every mission (not expert though).
The best way to get over the 65k mark in survival is to be lucky enough to get a bomb when the three little beast kings come with their tons of minions. Getting a bomb ups your speed by so much that if you're already at about 35k simply not falling or getting hit too often will get you to 65k no problem. Not getting hit is far more important than not falling.
moving towers is great and always receiving full value for any tower or upgrade you recycle is much appreciated and the memory system is much better than the money or mana in other TDs 5/5!
personally I am not a fan of this game it is fun at some points, but truthfully the learning curve is quite steep; unless you come up with a near perfect strategy you find yourself repeating the same level over and over again. The fact that the gems you summon is random does force you to have a somewhat flexible strategy, but becomes more annoying than anything else after the first few levels. This game was a good idea that could be better but changes some of the core values that good tower defense games all share.
finally a game where the last boss whose supposed to be the biggest baddest guy in all the land is the hardest boss and with health enough that the health of every other ship in the game combined=about 1/2 his.
It's just simply too hard to find a good balance of towers in the game, unless you pick your towers just right you get overwhelmed by wave 30 even in easy mode!
This is a weak fighting game only 3 combos per person and only 7 characters with no reral way to counter any moves except to block them or hit them before they hit you 1/5
I have the hard badge but the badge says that i've only unlocked 34 of the Harmony levels which you clearly need to beat to even attempt the hard badge :-(