Yeah Donkey Kong and Diddy Kong ! I really love the DKC series and Donkey Kong 64^^! My favourites is DKC2 and DK64 . However, for some time, there are very few Donkey Kong Games, and it's a shame: ( Especially as the series celebrates the 20th anniversary of Donkey Kong Country in 2014 ... I like a lot the picture ! Great Job !
World 3? Oh you haven't tried World 4 yet. That had THREE mine cart levels and TWO rocket barrel levels. Also, the later levels and the K levels(which you unlock after getting all the KONG letters in a world) are very difficult.
Believe it or not, I actually completed the game 200%(that includes Mirror Mode) back at 2010. I also got all silver or better in all the levels' time trials. Very difficult game, but still an awesome game.