Nice work Zapmore,
Excellent use of music - it all ties together well and didnt become repetitive for me at all, really well done.
Your game is a lot of fun, the stages are well thought out - it absolutely require you to stop, think and proceed carefully.
However - your game is also BIG on speed and reactions. I didnt paticularly enjoy this mix of elements because it basically meant that I had to play the same stage many times. Once slowly and thoughtfully - then a bunch of times trying to do it at high speed.
I think that the idea of actually getting medals is GREAT - but i dont think they should be required to pass the stage (by doing so I feel your limiting your games playerbase to those with quick reactions). If your set on keeping that mechanic i would suggest raising the time allowance for bronze.
Stage 3 was amazingly hard (If not for testing and feedback purposes i would have stopped playing on this stage - I had passed it ok, but getting 28 seconds wasnt easy! Infact I felt lucky to get bronze!), maybe it should be pushed back a bit as the next couple of stages werent that hard.
Still, good work so far!