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Have you thought about a second level? It's a bit frustrating after one beats the boss and then the game ends. I'd love to have a second level

No it doesn't. Apart from Ed being the former Microsoft game department guy, etc, etc, this article you quoted applies to games that were ripped off 100%, like all those versions of Galaga or Space Invaders, where only the name, colors or some sprites had been changed. This game is an original piece of art whatever the deal is with the game it was inspired from. It's a completely different thing and it has been created from scratch, not copied.