Further, if your idea is simple to copy it will be copied. See Threes vs 2048. Sure, yours might be best for some defintion of "best". Maybe? A recent example is the Suika Game. It's a game, once you know the idea, you could write, without an LLM, in a few hours. And so there are 100s of clones. The original has some deliberate design choices that some of the clones might have missed. On the other hand, it's got some bad choices that I'm guessing some of the clones didn't bother to copy. Further, it's a simple idea so it's easy to make and then add stuff.
As for wigglypaint, it's not a new idea. Dr. Katz was made in Autodesk Animator in the mid 90.s https://youtu.be/XxhS0U9-Z84?t=154
Neither is the "draw under the lines" a new idea. Two I know of, the Paper App (iOS) and MyPaint (Amiga, 1991). I'm sure there are others.