I have a few suggestions:
Make some sort of racing stadium where pings can race and win prizes on various disciplines. Also make some quests and an achievement for it. It would be unlocked at about level 80 or 90 and would cost about $1000000.
Also make a hotel whose owner would be Pingy and that would earn profit (and experience) from the rent of rooms. You can expand the hotel to accomodate more customers. You could buy it at the shop, or it would be a new location, or something. And please, lower the exp required to go up a level, as of level 70 or so it’s taking up forever to reach higher levels.
BUGS: Found a bug (I think), in the Hats page: two hats are named “Motorcycle”.
why there are no quests for the factory? and what is needed for the achievement, to get a high combo or to sort a high amount of fish? if it's the second, then I think it needs a counter for the sorted fish.