Very nice platformer.
I usually don't play much platformers and I am not so good at them, but this one is really good. I like the retro graphics, the music is really good, the story seems interesting and to be able to change the difficulty level was nice.
I have only played through the game at beginner yet, and I am going to try intermediate as soon as I have time.
And I haven't found a single bug, so I don't have much bad to say about the game, but there are some changes that I think could be made. Spikes shouldn't damage if touched from the side, was a little annoying at some places when I jumped too low and went into spikes from the side and got damaged, but not a big problem. And more challenges with the enemies would be nice, since most of the challenge in the game was spike and platform jumping.
Was a really good retro-style platformer, and im looking forward to episode 2 and Mardek 3. :)