Glad to hear you finished it, I've been hoping that people would do that. Went back and re-assessed my code, and managed to squeeze in instructions to hold the button to bounce, so hopefully that helps someone avoid frustration in the future.
As for the logo, that's pretty hacky. The characters are actually printed in black to the top left corner of the screen, then that area is scanned left to right top to bottom via a single loop using the floor divide and modulo operators, and the color value is tested for each pixel. For each one, a circfill command is given, but the radius value has the pixel color of that spot subtracted. Since subtracting 12, the number of the background, results in a negative radius value, no circle is drawn for spaces that aren't black. Finally, a blue filled circle is drawn over the printed text to hide it.=) You can see it printed out if you delete the chunk of code that looks like this:
c(0,4,k,12)
Oh, also, in case you hadn't tried it, I thought I'd mention a little easter egg. If you press the directional buttons on the title screen, you can make Squirt do a little dance. It's just an unintentional side effect of reusing his code while restricting movement, but with tweetcart games, you've gotta make bugs into features!