I do like the way you reinterpreted the spacy AA background as a sort of skewed twilit vista here, but I think the Bastion itself ought to be a more vibrant, interesting color than a simple steely grey, which seems unfitting considering its contents. Maybe a reddish purple or a jade green or a midnight blue might be a nice choice, giving us something a bit subdued, but which still has a certain suggestion of the strange and bedazzling scenery within. Also...maybe a few lamps outside (ideally glowing with a sort of rainbow hue) might be another way to give the exteriors a more distinctive feel...?
Gameplay-wise, I don't have much to complain about. It occurs to me now that the punishment for just barely missing the return trip for the first coin is being crushed against the wall, which is instant death even when big--perhaps yet another reason to consider replacing the sprite blocks here with proper block-blocks. Also, it seems that the final staircase of vanishing blocks in the second section is still not quite possible to ascend without the player dropping down in anticipation of their appearance (the last one always seems to vanish just before I'm about to land on it), despite looking like it ought to be possible without doing so. That still strikes me as a bit to deceptive, but I suppose that's something of a subjective impression.
Otherwise, I agree you're approaching completion here.
Gameplay-wise, I don't have much to complain about. It occurs to me now that the punishment for just barely missing the return trip for the first coin is being crushed against the wall, which is instant death even when big--perhaps yet another reason to consider replacing the sprite blocks here with proper block-blocks. Also, it seems that the final staircase of vanishing blocks in the second section is still not quite possible to ascend without the player dropping down in anticipation of their appearance (the last one always seems to vanish just before I'm about to land on it), despite looking like it ought to be possible without doing so. That still strikes me as a bit to deceptive, but I suppose that's something of a subjective impression.
Otherwise, I agree you're approaching completion here.