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[MisterX]

By the way, It was changed to look a little less Night Sky-y: http://appshopper.com/games/trundle

[allen]

here's the new pinwheel scene with the new gear character (upper right):
 

compared to the old one with the original character:

[Craig Stern]

Furthermore, when do ideas become common enough that it is Ok to use them?

I have two answers for you:

A) under U.S. copyright law, ideas are never protectible--only expression is protected. Copying art work that someone else has made is not copying ideas, however--it is copying expression. ("Style," on the other hand, falls on the idea side of the line.)

B) You seem to be trying to talk about things that are in the public domain. Basically, you can copy expression with impunity once the copyright runs out, because the work then enters the public domain. Right now (don't quote me on this) I believe it lasts for the life of the author plus 70 years. By contrast, it's worth noting that the courts come down especially hard on people that violate the copyright of works that are still unreleased! (Here is the Supreme Court smacking around somebody that published a portion of ex-president Ford's unreleased memoirs without his permission.)

[Eric McQuiggan]

After playing trundle, I fear it has no soul.

[Mipe]

Funny how the terrain remains exactly the same... just grass is different. Carbon copy much?

[Adamski]

They're just black silhouette land tiles  As far as cloning goes, Id say they're the least important thing to worry about, I might use black terrain in my game.