Fan games such as Sonic, FNAF, FNF, etc, and continuously creating them will lack a significant amount of originality upon yourself.

Take this video for example: https://youtu.be/lsREvMEbyOs?feature=shared
Not all of you grew up or have heard of the classics that are back in the 90s, but to those of you who did play and really enjoyed these types of games, then use that as an inspiration. Not just its elements, but also the mechanics such as collecting items, requirements to unlock an upgrade, etc.

Even if the games are original, I often see them as very generic. I kind of don't understand how a lot of people don't take full advantage of the Scratch engine, but like they all say: everybody is different. I know everybody doesn't want to advance further because they're just doing this as a hobby, but to those who do want to grow, then consider about these things that I recommend.

If you can think outside the box and pull off as many tricks as you can, and polish the game as much as possible, then your work will eventually be payed off sooner or later.