Hi Neil, I remember playing this game in 2013. It keeps being as amazing as it was then!
I would like to try and make a spiritual clone with https://bevyengine.org/ and https://github.com/Jondolf/avian for learning purposes. I've read the other comments here, and I would be glad to have the source.
Would you be up for sharing the source with me and with a possible clone in Bevy?
If so you can find my contact info here.
Many thanks in advance!