It's basically amorphous+ but a little worse in every way. Less achievements, no witty comments on the achievements, enemy types are pretty much all the same and the graphics aren't as good.
lol last boss was easy. He only attacks if you send melee units at him so just send units that attack at a slight range, like the forest guardian and the angels or the dragons.
for level 17 this is how i did it. Fully upgrade humans so you can get the titan unit. Hold off enemies with bow till you're fully upgraded and your mana is at its max. Then summon titan unit and send the wizards, crossbowmen and healers once he's about a third of the way across. When he reaches the castle stop sending units and save up for the next titan unit, that one is gonna die. Basically keep doing the same thing. When the end comes, you can keep him from reaching your castle by spawning titan units. You can get a new one to reach him before the previous one dies, and have wizards and crossbowmen attacking him as well. Hope this helps.
last boss is easy when you're a ranger. Kill the guards then use frost arrow on him, you can pretty much kill him before he even reaches you. Well that's for the shadow boss anyway, maybe the king has ranged attacks
1 life lost in 1-3, 1-4, 2-2, 3-3 and 5-2. To get through 1-3 with only 1 death you have to kill one within jumping distance on the spikes, then while you're on it if you move to the left side it'll VERY slowly move to the right. Takes ages but i don't think there's any other way to get the hardest badge.