Unlockables/bonus levels in Bit Trip Runner?

Question

I just beat Bit Trip Runner and...well...I was a little bit disappointed by the ending on Normal mode. Are there any bonus levels or unlockables I can obtain by meeting special criteria, such as beating it on a higher difficulty or getting all the gold across both the normal and bonus stages, or is that really the end of the game?

Answer

Bit.Trip Complete! will soon be out for the Wii. It features all 6 games in the bit.trip franchise, and 20 bonus levels for each game within the collection as well.

So, not sure if you want to shell out for a whole new game (but it's an awesome Indie dev, so maybe you do?), but the challenges are supposedly FIENDISHLY DIFFICULT. Given that each chapter of Runner has less than 20 levels, you're getting more than a full third of extra Bit.trip running goodness!

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How do I get a “Perfect” in Bit.Trip Runner?

Question

I've been playing Bit.Trip Runner, trying to ace the Retro Warp Zones and get the "!!" on each level for collecting the gold. All the gold.

I had thought that simply collecting all of the gold was sufficient to earn a "perfect", but I managed to get a "!!" score on level 1-5, and yet, I did not also get the "PERFECT!" That I got when "!!"-ing 1-6, 1-7, 1-8, and 1-9.

Edit:

As Mr. McClelland points out below, a PERFECT! rating is scored by obtaining the maximum amount of points in the level.

What actions increase your score? I know collecting gold is obviously part of it, but not all obstacles (such as sliding under low overhangs, or jumping gaps) reward points...

Answer

Quoted from the wikipedia article:

The perfect completion of a retro challenge will award players with an exclamation point beside the stage and the word "PERFECT" beside the score in the scoreboard, but only if they have done everything "extra" (i.e., jumping on top of springboards that they do not need to in order to finish) in the level beforehand.

Edit

According to this gamefaqs forum thread:

! = All golds collected; advanced to Retro level

!! = All golds collected in Retro level

As such, it sounds like you need to not only get all the golds in a zone, but also all the golds in its retro levels. A bit of forewarning, I don't actually own B.TR, so I can't confirm any of this data.

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