This game isn't as hard as most people say it is. The double jump always works, but some people walk off the ledge before jumping and waste their second jump. An easy way to tell is the cloud/dust under a jump. A flat cloud is a normal jump while the heart-shaped cloud shows the second jump.
This game was meant to be hard. It takes a couple of run-throughs to complete some levels but it's worth it in the end. I'm going to try to get the impossible badge within the next few days, but my laggy laptop is ruining the fun. 5/5.
There's a pattern to the masses of enemies appearing while destroying their fortress. ~30 to 75 (not sure what exact numbers are. They also depend what phase it is) enemies appear when its at 3/4 health, at half, and last when it's at around 1/4 health and almost destroyed. Go all in at the end. It gets easy at the end, but it's repetitive and takes more time for each level. Just to get all 30 cards, a couple play-throughs are necessary.
When the enemy attacks your castle, it shows their picture, "Castle Name" (without quotes), and it says Has Ben Invaded, which not only contains a typo but says that you are attacking when it's actually the other way around.
Oh, and the text in the description box for the achievements go out the right side. Maybe text wrapping or a scrollbar would make it less confusing. Otherwise, for something like the Level 3 armor, we have to highlight the text an drag to the right to view the entire description
 "Run"){kind=icon}
 "MoneySeize"){kind=icon}
 "Ultimate Kongregate Quiz"){kind=icon}
 "Epic War 3"){kind=icon}
 "SHIFT 4"){kind=icon}
 "Medieval Rampage"){kind=icon}