Adorable pixel art style! I really love it! Maybe I could ask what software you used to create the pixel-style artwork?
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I'm glad you liked the art style! I don't consider myself a good pixel artist so it's neat to see how people really like it!
Answering your question I used Libresprite, the open source/free fork of aseprite, you can find it here: https://libresprite.github.io