Wow! Just wow! You nailed the retro vibe so perfectly. Very good attention to detail. The player knock back when hit, the way things appear and fade in and out, even the sounds and text boxes were just so spot on. If someone told me this was a ROM of a legit Nintendo game, I would have believed them.
The checkpoints were well placed. The level design was brilliant. The items and powers were unique. The theme fit.
My only feedback is I wish the up arrow key could be used to jump as well, but the game was still perfectly fine without that!
WHAT A BEAUTIFUL GAME! MY FAVORITE SO FAR!