Pixel art in 1280x720

I want my game to be done with pixel art graphics, though I don't understand how I can get my pixel art graphics to work in the 1280x720 requirement for backgrounds.

scale up your pixelart
The only problem i see when using bigger resolutions than the graphics which are used is that the character movement looks weirder because they can walk "between the pixels"

I'm not sure you understand
If I make a character in a 32x32 canvas, it comes out blurry when I re ajust the size to make it bigger

It's all about scale ratio. Your characters should be approx half the height of your game default resolution @ 100% scale value. Scaling up or down will always create artifacts. It's actually better to scale down than up, because down often makes things sharper although it can lose detail, however scaling up will often end up blurry / pixelated, thus it loses even more detail than scaling down.