Wonderful! An absolutely GORGEOUS remake. So beautiful, and I'm so glad you've kept the Beeper sound effects which give the game so much of its charm!
I don't know if you're planning to remake the 3rd game someday but I love that game too and always thought it needed some atmospheric "castle" music, so a few years ago I made some AY music for it just for fun (I'm a game musician). If you need any music in future feel free to give me a shout. I mostly do AY but I sometimes venture into "normal" music.
By the way I like the colour you chose for the sprites. That seems right. What are Olli & Lissa meant to be anyway? Human on the cover of the first game, dogs on the third, while the sprites look more like Mr Men or something! :D