Ok so this game is:
a ) a part of the nitrome series so you should take care of that
b ) you should add individual levels to this since there are "levels"
c ) after you collect all the gems once they all disapear making you needing to reset the game in oder to do a all gems run...

thats it

I recently got moderation of this game, I am talking to ConorMcMahon to add it to nitrome series, The IL is one of things I will definitely add.
And about the gems should I delete the category? Because I deleted the 100% which requires have all the dog houses while the game doesn't have the amount of gems to buy all dog house :v

I found that this game has a web version, in this version the gems are reset every time you play, so I will keep it for now