Really nice game, but a lil biased cuz i love lego hehe
but i think making seperate currencies takes away fron the decision-making, it would be more fun if it was just gold dots to collect and the played could choose what to invest in (it would also make the player able to make a full-defense, or full-attack tank)
also the enemies are very few, it takes quite a long time to find one. so either enemy number should be more, or map should be smaller. but apart from that this was very well made!