i don't know how to score this but 2 bugs
1 if you jump left when you first start nothing happens no death nothing
2 when i was landing on platforms it would make me do a double jump for no reason
Firstly, this has probably been made from a YouTube or NG tutorial or something, because I've seen this exact same game, even with the same level design many, many times.
Secondly, the jump button is seriously unrepsonsive.
Thirdly, there is a bug, or an.... inconsistency where the player's HP does not reset after he dies. This is vital for a platformer game.
Fourthly and finally, please do not submit game demoes to NG unless they're of a high quality. The 'character' the player controls is a rectangle!
May I recommend some tutorials on this website? Under 'Collections', scroll down a bit and go to 'Flash Tutorials'. While the tutorials are for an older version of Flash, they suit Flash's current flavour similarly as back then, and they're very 'in depth'. Please look at them - and don't forget the NG preloader next time!
I dunno what to say about this, other than the jumping is way too stiff.