I like it, but maybe it would benefit from using (X) to jump. Additionally a louder sound when jumping might also help. Also for the score and other text maybe try using:

for x=-1,1 do
 for x=-1,1 do
  print(score,0,0,0)
 end
end
print(score,0,0,7)
--cause text to have a black outline.
--usable on any text
--makes text easier to read

Even as is it's a good game, and on top of that a really solid first pico-8 cart.