In theory there is already different themes for each level ( 2 colors only, only animals etc.) but I didn't have enough items/ time to properly flesh it out and also think it doesn't really matter gameplay wise.
I have a post jam update lined up where I'll add level challenges for bonus points => No animals on the left, at least 3 super sized items etc. And you'll collect "trophies" in your trophy room as a medium/ long term incentive