Thanks for your kind words!
Next time I look at it I aim to improve the randomness-ness and I may look at having a selected skill level but I notice that "very-easy" comes up much less than other skill levels, so it might leave you waiting for quite a while, while it finds one (at very-easy) --- I'll have to play with it...
feel free to make suggestions the more reasonable the greater the chance of it happening
! (although I do want to keep it very simple, I think the more "aids" the worse an experience you get)