I think I found my best deck so far. The red butterflies and the butterfly upgrade let me fight against large groups almost by myself. I focused on getting more archers from the beginning, and whenever I had the chance, I kept upgrading them.
By the end, they were extremely fast and really strong. I also built a tower next to my castle and kept upgrading its health whenever I could.
I probably played most of the game with around 2.5 economy houses on average. Thanks to the upgrades and having enough units, the army I had been building since the early game did a really good job.
This was on the first map. I’m going to try this deck on the other maps too. My final score is 576764 at that game.
I used the same strategy and got an even better score on Map 2 :D