After losing several times, I managed to beat the game, first time, I died, but managed to kill the king. (I guess as long as you kill the king, you still win even if you die, it just alters the ending slightly)
As of writing this, I finally beat the game with health to spare. I gotta say, I did not expect this game to captivate me as much as it did, its simple, yet complex. I bet this could be a really good port for mobile due to its minimal interface.
Heres some tips for those who are struggling (they helped me to some extent)
-Don't neglect the bard, the bard really shines when paired with units that summon, such as the Funny Bone, Skull and your Summon Skeleton Spell. Main weakness with this strategy is that you cannot divide the lane into other ones. If you decide to get the Rockstar (who shields summons on any lane) and get your bard to level 3, any summons you have become terrifying.
-Don't be afraid to sell obsolete units, even at level 3, units such as Viking and the plain skeleton fall off hard compared to later tiers. Despite that, Skeletons are really useful early game due to them returning money on purchase.
-Watch for synergies, some units really excel when combo'd with other units or spells, examples being the Succubus and Shield Spell, or Milkman and a high damage unit behind it. Or the Giant Skeleton and the Nurse.
-When in doubt, Spy, you might be tempted to save your spies for later, but if you don't know if your forces are gonna win the next round, knowing where the kings forces are strongest can buy you some time to turn things around.
I do have some critique however, namely the buildings, I don't know if they are glitched but judging from the descriptions, the farmer and the blacksmith are supposed to give permanent upgrades at the end of every turn, but they only upgrade once on purchase, making them a trap investment when compared to Milk which gives a +1 to everything.
Only unit I don't like is the wizard. Yeah, he is powerful if you got a loaded spell book. But your also forced to use spells prematurely or forced to reserve them to make full use of his magic. This can sometimes make the wizard a detriment. Though in fairness, this could be the point, I never did manage to get wizard to max level before the game ended, one way or the other.
Overall, this game really stands out, well done.