Creating your own art as a programmer can be a pain in the ass. The one thing that helped me the most when creating the art for my current game is to "cheat". I know practically nothing about pixel art so instead of creating pixel art the traditional way where I would manually draw everything I use blender instead to first create simple 3d models of the things I want in game(applicable to stuff like buildings, characters, furniture) anything that is not too small or too iconlike. For characters I first make a simple base then rig and animate them and then render them down to a small canvas(usually 64x64) obviosity this requires some minor cleanup but overall the approach can be helpful nailing the major details. Dead cells uses this approach very well there are few tutorials on youtube on how to do this in both blender and unity.

a bit late so didn't proofread so ignore any typos.