i just started it the game without reading your comment or the description to see if i get it because i saw the other comments ^^ . i must say at first yeah it was a little confusing... but then i got it piece by piece ^^
i liked the idea and it was quite fun.
but i couldnt tell if there is a difference between the tools other than time cost.
and the alarm sound...OMG...it triggerd me so hard i couldnt read xD. i played likw 20 cases without sound. only one to to test.