Mediocre on what scale? For your game to be in the middle or elsewhere on that scale, you would have to establish what is an excellent game and what is supposed to be a horrible game.
What is your competition?
You can find an arbitrary set of criteria to select the games and rank them.
https://itch.io/games/genre-platformer/platform-web/tag-arcade/tag-cute/tag-pixe...
Bam. 120+ games in that one. And your game is on page 1 / 4. It must be quite good then.
On that list below you are even on place #1.
https://itch.io/games/genre-platformer/last-30-days/platform-web/tag-arcade/tag-...
Unfortuantely, those lists only told what itch thinks is "popular" and recently so, not what players thought about those games. One can deduce that, after the games were around for a while and enough people rated them, but as you can tell from experience, that part is hard. Actually it is the topic of the thread here.