It's very fun!
However, I really think it should be sped up a bit. Also it took me a while to understand that you can merge leveled up units. Also, since every unit does one damage to the enemy base, it's not really worth buying any skills or buildings that take up unit slots (unless I've missed something and buying them is a winning strategy).
Having to spend all coins every round makes the money building not very useful (until you've leveled it up?). Now you just have to reroll just to get rid of extra coins.
https://i.imgur.com/f1hEfKi.png, https://i.imgur.com/fXjNH3T.png furthest I've gotten! I wish it would have won as soon as the health went down, I just needed one extra life :(
Edit: got to the king, damn it feels impossible!
You should totally add medals to this game!
I WON!! https://i.imgur.com/YQH1IZY.png