Clash at Demonhead is a complex game to say the least. There are over 40 levels in the game, and they are all connected to each other. In the network of levels the player must find 6 medallions and then rescue the kidnapped professor. This is no simple task. To make things even harder for a (tool-assisted) speedrunner, there are items available that greatly increase the player's speed, but in return cost money. This means that the route and strategy must be carefully planned.
This movie certainly does not lack speed or complexity. The movie is especially entertaining if you have played the game and know how hard it is.