Thanks so much! I'll take some of that into consideration! Can I also ask how far you got, and, if it happened, where perhaps the game became frustrating or stale in the mechanics introduced? I'm wondering about how different ideas to be in order to mix things up versus keeping the cohesion of the small idea intact.
(The main classical music here was Mendelssohn's Symphony No. 4 in A Major, Movement II, Op. 90 ;) )