Very cool to see! As many have said, this actually improves on the original with sprites that are wonderfully drawn and feel very true to the arcade whilst being given a modern makeover. Well done treading that line so well!
One thing - and this is just me being curious and in no way critical - in AGA versions do you think the parallax backgrounds from the arcade might be possible to achieve?
Really great work, excited to see updates as you work on them!