I really like the idea of this game. Of course, it is easy to play but the groundwork you've laid allows you to do a lot more with this game. It's so simple and yet interesting. Different objects to block, reduce or even amplify signals, maybe something to amplify signals in certain areas, directional antennas, etc. are possible things you can add to this game. The 97% requirement was a good idea personally (there's a fine line between getting everything and getting most of it, as depending on the calculations, it could be extremely hard to actually get it all, which is nice that you left as an option instead of forcing us to do it). Maybe an option to disable that and have achievements to completing them all at 100%. Anyway, good luck!