Many people use Kotlin to create serious stuff, but it's also a great language for creative coding
.
The https://guide.openrndr.org is a great place to start.
Or the 30 videos @mimetik and I posted so far:
https://www.youtube.com/@in_conversations/videos
https://tubedu.org/c/in_conversations_collections/videos
3 years in and it's still one of the most enjoyable languages I've used.