Great job submitting a game! I love the concept and the visual style. You managed to pack a lot of information in the Nokia restrictions and it looks great!
For this one I am just going to ramble about my experience. My first attempt I sent out one knight and one peasant. The peasant never returned its resources so I was stuck. Then it became fun trying to find a winning combination but the behavior of the peasants made it a bit difficult. The peasants were always faster than any of the other units so would always get killed. The peasant behavior was frustrating at first but It became a game of timing the unit spawns correctly. Again, I actually enjoyed this process of deduction, it makes me want a easier/faster way to restart the game.
On my final run I had it figured out but the peasants I sent out after the initial wave never collected their max resources so they never returned. I had one knight hitting the enemy castle but I wasn't sure if it was doing anything because the enemy castle health bar didn't go down. I was lucky because the enemy ran out of resources because they started spamming peasants at the end. Eventually I destroyed it though!
The archers ai is awesome, its cool how they back up to get in range of the enemy. Probably the most powerful unit for sure. You did a great job of creating a complete experience here but it just needs a little polish. Thanks for participating!