Hey there, thanks for the feedback and ideas, I appreciate it :].
I will keep your suggestion in mind from now on regarding unit capture as I look at how the game plays, as you make a fair point (like how in chess, a pawn can capture any unit). You would definitely have to be more strategic/careful when attempting to capture enemy units, while at the same time the opponent is better able to defend themselves.
I definitely want to create more intelligent AIs in the future. This simple/easy AI does not think past the current turn, whereas future AIs will use some kind of alpha-beta pruning and simulate future states and calculate values of each state.
Thanks again!