Wow this was really fun! The challenge level was somewhere between just right and too hard, but I always felt like I was just on the cusp of beating whatever level was giving me trouble, and I did end up pushing through and finishing every mission, that was awesome!
For some reason I was never able to build archer units, but my spearman/highlander and knight combo was able to handle all the RTS stages. I got every coin in the game, although it seemed like the "Kill 3 trader" one was bugged for me, so I couldn't get that one. I killed 6+ traders and it didn't pop, and then I even killed exactly 3 traders and then finished the mission but I couldn't get the coin. Regardless, this was really fun and I couldn't stop playing.
I like how the multiselect patch was locked behind an impossible amount of money (I'm assuming, since I got all the coins I could), that was funny. I was a big fan of the voice sound effects and the peasant voices in particular, I've used voice sound effects for a jam before (pinball game) and that's always fun and gives a really personal touch.
I would definitely play more of this, thanks for making it!