Cool game about rescueing your kittens. Funny dialogue.
To avoid blurred pixel art you need to:
Best: Change the texture filtering from Bilinear to Point (Thats how you do it in Unity)
Or: Scale up the Image in vour pixel art program. (If you can do it like in aseprite you can do that in the Export menu)
(If none of the other methods work you can also do it with a bigger Pencil size)
One Idea that came to my mind when I saw the playground was to sync the platforms with the background. But this may have led to bad level Design