2d platformers were all the rage for the first 3 to 4 years of the C64's existence. Brian Bloodaxe was a platformer which was VERY quirky and has extreme British humour which is very Monty Pythonesque (check out the tape cover art.. how did they get away with it?)
The idea of the game was you had to guide Brian through 100 levels to steal the crown jewels to take the British throne. Brian Bloodaxe was originally released on the spectrum and ported to the C64 and it shows. A lot of the sprites are big and well detailed but the flicker on them is really bad, something which the C64 didn't really suffer from in general.
I don't think I ever paid for this game, but I have a place for it in my memory as i'm sure like most kids we all at one point passed a 'blank tape' with lots of games on around school and this is how I discovered it.
Sound was decent, with the Flying Circus theme as soundtrack ( I guess it was royalty free?) and there are little nods in the enemies sprites to British culture at the time like Daleks from Dr. Who.
The C64 version was bad though, and it must be the biggest difference in review scores between the ZX Spectrum release which was universally praised and the C64 port which got just 18% in one magazine!
One of those titles which gives you a nostalgia fix when you replay it again for the first time but within a few minutes realise its nowhere near what you remember!