Impressive! The music is really well converted, and the colors have a very... psychedelic look to them, which I guess is appropriate too :) What's different from other versions however (at least Amiga and PC, with which I am familiar, and also the C64 version as far as I can see here https://www.youtube.com/watch?v=lTKmyqqugG0) is that the Lemmings seem to pause after each step, in the original game the movement was continuous. Maybe due to some calculations which have to be done while no animation is playing?