A very nice tribute to the classics!
I appreciate the idea of making an old school platformer like this. Very Metroidish, and that's not a bad thing. The graphics aren't top notch, but who cares: solid gameplay always surpasses visuals in importance.
Pros:
+ I was surprised how compelling the story was for a flash game.
+ The checkpoints were appropriately placed.
+ Map system ok.
+ The challenge system made it like pretty much a new experience.
+ The main boss was well designed! It truly grasped the same feeling as many bosses in similar games before: success lies in the combination of trial and error, learning the behaviour and fast reflexes.
Cons:
- Although too much complexity should be avoided I think the control system or game play mechanics could use some kind of extra spice. Well, who knows, maybe the latter stages will include something like that(?).
- Not a big thing, but some of the walls look like they could be walked through (= they look more like background).
- The map could show the rooms that you've visited before (like in many Metroid games for example).
All in all, as I played the first level through on the normal skill level, I grew to like the game more. At first I was considering giving this a 7, then it rose to a 8 and now I ended up giving this a 9! :) Looking forward for the sequels. Good job!