I think you should definitely proceed with making your course; it's different enough just by having you as the instructor. As an example, I follow about 10 different creators regarding how to grow a YouTube channel. There are many more than 10 creators who teach this topic, but some of them are just 'annoying' for me, even though they're teaching the same content, there are other people I prefer to learn it from. To tie this all together, there are 8 Billion people in this world, so there will be plenty who would prefer to learn about Unity Tower Defense from you, because they prefer your presentation and style. Go get it done!
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