I'm both glad you liked it and, erh, sorry you found it frustrating :]. I agree with you about the lack of sound, but I blocked on the "sound should be chiptune" rule, as I could not see that kind of music fit my game. Making the game in 3 days didn't help neither. About precision, yep there's an issue here I tried to arrange by defining sliders steps for each screen, but it sure can use some more tuning. But I have some ideas for the future!
Never heard of Simian Interface, but I just checked and now I want to play it!