My game has both a level creator ( you can contribute that way ), but now also has the ability to customize the pixel art used in the tile sets that render the game. Feel free to give either of those a try on your own. Another user will be enhancing the existing tile sets, but nothing stops anyone from really making their own. Feel free to post at the community link below with anything more you want to share!
(( This community post talks all about it : https://itch.io/jam/alchemy-jam-7/topic/5703935/joined-and-jamming ))
The latest version is now available at https://itch.io/jam/alchemy-jam-7/rate/4154591 and it includes the multiple tile sheet animation things -- if someone locally provides these sheets, their game will feature the animated tile sets.