Good execution, controls from DS game very closely implemented. Only one flaw; the puzzles themselves are very easy. I completed 1, then skipped to the end to see if they got any larger - 15x15 is far too small.
I got a(n) A- on hard! My score was 3978142 with a max combo of 142. I scored 196 perfects, 146 greats, and 10 goods. I got only 1 bads and 4 misses! I was playing on 10 speed and had 1 crazy options on. Great game, I like it! Play it here: http://www.thorgaming.com/games/3926/feel-the-beat.html
4/5, timing is a little off, but the songs are great. well done.
the last mage skill is overpowered, as others have said. Slow is pointless, necromancers are too slow, and dexers/chiv dexers are useless compared to mages with +1 range, but other than that the units are fine. Levels built to accomodate a specific strategy would be nice - it seems as if they were somewhat created that way, but every so often a wave comes that seems to be custom-fit to get through your layout. Levels get easy to beat when you can just spam units - increasing the rate/benefits of levelup while decreasing the price, combined with an increase in unit cost, would fix that. Tip for others: use poison.
 "Castlewars"){kind=icon}
 "Eternal Red"){kind=icon}
 "Picross Quest"){kind=icon}
 "Rapid Wars"){kind=icon}
 "Clear Vision 2"){kind=icon}
 "Feel the Beat (F2Jam)"){kind=icon}
 "Protector"){kind=icon}