Nailed the nostalgia!
I originally visited Newgrounds today to take a look at the new submissions, and I've been playing this game ever since! I believe some of the other reviewers have brought up the very same "glitches" I've already run into, so no need to repeat them.
Strangely enough, if you were to tell me you INTENTIONALLY added/left those glitches in on purpose, I'd completely believe you! For me, it added to the nostalgia. I remember glitches like that happening all through early NES games. Especially Metroid and Kid Icarus.
Bottom line, phenomenal job!