I did not get any crash actually. I think I could go out of the screen at the bottom but I died when I did. I haven't tried on real hardware, though.

Couldn't Axe corrupt your program data when pressing PRGM on an error even if it just read the code, though?

The part that I'm somewhat worried about is when it creates enemies.  It uses L1 as a stack to hold the coordinates, etc. of the enemies, and I'm not entirely sure if I added a check to prevent that buffer from overflowing.

Also, I made a platformer thing to practice, inspired by Canabalt.
Up key to jump, [2ND] key to temporarily turn into ghost mode (walk through walls, enemies, etc.)
Collision detection while ghosting is a bit patchy, though.
The bars to the left show you how much longer you can ghost.
The amount of enemies increases as you keep playing (well, slowly increases)

Axe source is ARUN, compiles to RUN.

Not if you're reading. Reading typically uses a different path than writing in microprocessors, so reading doesn't change the values of bits.

Ok, so basically when Axe opens the source code on an error, it must be writing stuff to memory, then, since some crashes apparently occured.

The part that I'm somewhat worried about is when it creates enemies.  It uses L1 as a stack to hold the coordinates, etc. of the enemies, and I'm not entirely sure if I added a check to prevent that buffer from overflowing.

Also, I made a platformer thing to practice, inspired by Canabalt.
Up key to jump, [2ND] key to temporarily turn into ghost mode (walk through walls, enemies, etc.)
Collision detection while ghosting is a bit patchy, though.
The bars to the left show you how much longer you can ghost.
The amount of enemies increases as you keep playing (well, slowly increases)

Axe source is ARUN, compiles to RUN.

Woah that looks great! It reminds me of Space Dash. I'll have to try this soon. Is it finished? You should probably put it in the downloads section and on ticalc if it's the case.

Did someone say space dash?

Regardless, looks nice Michael. I like the building effect in the back a lot The jumping looks a bit choppy? Or is that just the screenshot?

I love love love that background building effect!  It really gives it a canabalt feel

1] About the trail: I got lazy   I used pt-Change or Pt-Off to change the sprite stuff, and didn't clean up the mess.
2] Pressing the up arrow... I'm not sure what you mean - could you explain further?
3] The building thing is a bit weird.  I originally intended for all the buildings to be the same, and it was, but then I used a sprite that looked something like this:
████████
█ █ █ ██
██ █ █ █
█ █ █ ██
██ █ █ █
█ █ █ ██
██ █ █ █
████████
Instead of being a sort of darker gray like I though it would, it did something weird with the grayscale and now half of the buildings display as black with flashes of white/gray while the other half is pure gray.  Weird, no?  For some reason, it looks like each building alternates color, and pausing then continuing the game can cause the effect to flip-flop.

So by looping do you mean going so high that you come up through the bottom if the screen.