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I'd say getting the gameplay core loop done should be first priority, make sure it's fun in it's simplest form, then art would be fine to work on. Having a good looking game that feels clunky and unfun is often worse than a simple looking game that is fun to play. 

Also if you have amazing art at the first round, but not a lot of content, then anyone who adds content would have to either match your art, or scrap all art assets to make it look consistent.  And if they aren't as good of artists as you they are more likely to choose the second option. 

Thank you! I suppose the later devs will be looking for gameplay to change, not art. changing the gameplay is what will make this fun, not adding more art content.

The problem is, that even gameplay changes often require new or updated art. For example, if someone wants to add some powerups or new moves for the character to your game. 

On the other hand, anything goes and art might work as an inspiration for next devs!