Good game with a big problem – Mushroom War Review

It's a good game with a big problem. That problem is that the levels get impossible. I made it to level 3-8 and I can't get any further. I've tried everything but the castle has too much health to beat. I've gotten it to a sliver of health but it won't crumble before the enemy builds up an impossible to beat army. Please help me out here!
Review by Bergevin's on Mushroom War.