Hello,
for you to change or edit the content you need aseprite or any pixel art based software
because the project is in both png & Aseprite format
How to use it?
Since the project files are in Png format
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Open your Unity project and navigate to the Assets, Resources, and then Images folders
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Select the PNG image in the Project window
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In the Inspector, change the Texture Type from Default to Sprite (2D and UI)
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Click Apply at the bottom of the window
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Drag and drop the PNG sprite into the project hierarchy window
And for the aseprite
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Open Package Manager
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Press the + button and select Add package by name
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Enter com. unity. 2d. aseprite
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Press OK. If you see a Burst popup saying that a new version of Burst has been installed, restart the editor
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You are now ready to import . ase and . aseprite files into your project
let us know if you have anymore questions