Because this amazimg video (http://www.youtube.com/watch?v=BLJuuHqKCCc&list=UUUFwlB1KvK1SyPhozPY-wwg&index=1&feature=plcp) just had to be a game. So the game it is!
The BattyBovine did the hardest part of the game, which is everything except script, so come over to his tumblr (http://tumblr.battybovine.com/) or DA (https://battybovine.deviantart.com/gallery/) to tell how much you worship him!

!!Attention, the game might derp on slow computers!! You might want to close all the tabs and click the "download" button for better performance.

Gee, there are about ten rhythm heaven ponifications already! That would be totally cool to make a big game with brony music, don't you think? Maybe Flash is not the best platform for the task though.

As always, ponies belong to Hasbro and Lauren Faust, the music and the game concept is from Rhythm Heaven:Figure Fighter by Nintendo

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Edit:
OK this is probably the last update.
1) Problem with a Spacebar not working should be fixed now, but just in case you can also use "X" button or clicking mouse in the game.
2) About timing. You are supposed to click between Dash lines and music beats, like if Dash "jab" line is "l" and beat is "b", you should press "l^b_l^b_". I knowm that in the original game you are supposed to press on music beat, but I couldn't do it because apparently flash has some issues with playing sounds on time. Hope I can do better next time.
3) I futher increased time window when your pressing buttons counts as hit. For some people it will make this game frustratingly easy, but well, games are made for fun