I am an agronomist and I found this game really interesting!
Here is a quick guide I found
CDCDPDDCDCDC (DC) PCBPBDPCCBDCA
C = Coconut
D = Dandelion
P = Pomegranate
B = Bean
A = Acorn
I find it impossible to pass lvl18 in hard mode, even if I have been grinding lvl 11 and managed to buy chainsaw Fully upgraded and gatling gun with scope. There are many bad things in this game, e.g. no saving progress, not being able to farm lower lvls, graphics are bad (it took me a while to distinguish enemy gunfires), you dont get time to collect items, lose your gold when dead etc. It has a nice concept but hard mode is broken.
Nice one, without much grinding being needed. Satisfying feeling when you kill last boss. I managed it with 7 barrels (one in the back in case 6 front die so I can still use the skill) 8 Swords 6 Hunters 6 Spearmen 6 Axes and 7 Hammers (Thor). Everything was maxed.
Epic literally. Loved the concept. Quick guide that worked for me, Barbs, jokers, firecrackers, mage and in the end spearmen when u have fully upgraded the others. 2x potatoes 2x Servants and a Well along with the Target practice and Tax collector (which u can sell in the last waves for another troop building). For spells i used Potatoes, Zeppelin army, Orc and Fighter taunt. My unit upgrades were maxed, my spells not but i still got 100%