Not if it was a universal terminal velocity for everything.

So I tested it out. Great looking so far. Only a few things I found wrong, which most I'm sure you're aware of but just listing to be safe:
1. Can double jump and basically fly by holding ▲.
2. The collision thing with the roof seemed a bit odd. It would happen in some places and not in others.
3. When you click "New Game:
   a. You have the collision problem sometimes on the room (sometimes whole head disappears).
   b. Can apparently fall into the floor a little (only happened once).
   c. About 3/4 up the screen if you jump you can find ledges on both sides that are invisible.
      1. On right side you can jump and go off screen.

CalcModel: TI-84+
FreeSpace: 10,705
OS: v2.43
SerialLast: J (assuming that's the code on the back of the calculator)

Glad to see this coming together

Are you planning to make usage of almost the entire extra RAM on the 83+SE and 84+SE? I would advise against it, because then, anyone who have a 84+ manufactured in April 2007 or later will not be able to play the game, and your game won't run on a regular 83+

No, not at all.
It just gives me something else to point my finger at if it doesn't work.  I like to be thorough.

Ok, so here is the screenshot you asked for. I don't know if you were aware but you can also go through the roof in the "New Game" map. I didn't know that until making the .gif. But I'm pretty sure I included everything I noticed (minus the going through the floor thing, wasn't able to recreate that).

No problem.

By the way, I'm guessing that the train "glitches" like that to make it act like it's moving, correct?

Well, I thought of that, and I figured out a pretty good way to keep track of it.
When the game starts up, I save the current contrast.  That is the value I fade to.  It is also restored upon exit.