Very fun! I did notice a bug where I was ignoring the enemy's defense from walls.
Possible balance suggestions:
Speed doesn't feel very utilized. I think that it also indirectly nerfs spike because you can end up spiking them right before they house a new troop so the spike does nothing.
Would be cool to have a unit that does damage based on speed or something.
Wheat + housing does a little bit too much damage (I was doing 50+ by turn 3). Wheat feels strictly better than all other damage options - perhaps make it a bit riskier (+0 power if no housing nearby, +2 if there is).
Overall very fun but a little unbalanced (to be expected)