PICO-8 is awesome! And honestly, the fact that you produced such great work means the tool is just that—a tool! You all should be really proud of what you've achieved here.
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Ah, thank you! My wife used Photoshop for the creation of art and frame-by-frame animations; she's most familiar with it because of her graphic design background (I am so glad that she transitioned to game artist! :D). You may try using LibreSprite for pixel art – it's a free fork of Aseprite and it works pretty well. (A pixel art enthusiast here! :D )