(If the drawing tablet uses Android)
Step 1: Download Godot 4 from playstore (https://play.google.com/store/apps/details?id=org.godotengine.editor.v4&hl=en)
Step 2: Get pixelorama's source code (a zip folder will get downloaded, you don't have to unzip it) https://github.com/Orama-Interactive/Pixelorama/archive/refs/heads/master.zip
Step 3: Open Godot and Import pixelorama as shown in the images (by default the project will get created in Documents folder, so if you want, change that to some place else)
Step 4: After it finishes import go to Scene > Quit > Save and exit.
You can now, also delete the ZIP folder as well (that was downloaded in step 2)