It would be nice to have some visual feedback on how close something needs to be to be able to latch onto it. I also found (with my underslept-ass slow reaction time) that I was having a hard time clicking on things as they were passing by. However I could bypass this by Pause buffering (hey, thanks for adding a pause button :p!)
That being said, it would be neat if there were some kind of bullet time mechanic? It would make it easier to click on things for those less reflexively inclined.
On a similar note, it could also be nice to have visual feedback of an objects immediate trajectory. Normally I'd suggest a vapor trail but I think that would just make a vapor cloud (I guess that's just a "cloud" huh?). Maybe just for the player?
Neat idea! Would make a fun mobile game!