Made a vegetarian dragon! Have to drop sheep on the egg, but then grass and fruit only - managed to get to infinite wave 32 also with this dragon. <3
Hard badge at last!
Tips:
the flags are the most powerful upgrades - more powerful than having level 4 of everything.
HOWEVER, for the hard badge it really helps if you start with the level 4 gold upgrade. Otherwise you have to stay alive for a lot longer in the end game after the last boss.
Before first boss
ship upgrade, lv 4 gold, lv 4 flag
Before second boss
Ship upgrade, lv 3 flag, lv 4 gun
Before last boss
Ship upgrade, sell gold, buy lv 1 & 2 flags.
HARD BADGE WINNER GANG.
With the acceleration, air resistance, etc, you can save money by buying the upgrades in bulk. You actually only pay the price for the final upgrade, so it's the same price to upgrade from Level 0- Level 3 as it is to go from Level 2- Level 3 Acceleration for example. It is still the best policy to spend all your money every turn though, with the exception of when you're waiting for the glider upgrade to get the speed & 1,500m achievements. Just don't spread out your money, priorities are:
1) Glider
2) Rocket
3) Whatever you can make the biggest improvement to with the others.
If you have a choice about whether to buy a rocket or a glider, always buy the glider for the speed increase. This includes if you already have e.g. a Lv 2 Glider but only a Lv 1 Rocket. - Upgrade that Glider to Lv 3!