Would be cool if Pingy's dialogue changes when you put different hats on him. The pirate hat could make him talk like a pirate, kong hat could make him praise greg, etc.
There should definitely be an achievement, quest, or reward for fully upgrading your house. Was kind of expecting something to happen once I got that last upgrade :p. Perhaps we could unlock something? :)
Protip: If you're going to leave your computer on over night and afk, be sure to afk while on catch a snail. The bucket will catch 2000+ snails for you to use by the morning.
A nice option could be upgrading the size of the bucket for the catch a snail game. Also, it'd be a cool idea to have to ability to buy trophy's for your house once you have accomplished something. Perhaps getting nonhacked highscores in minigames and stuff like that.