Katamari is one of the best examples of chaotic games and you made a terrific game with the concept! Its funny you mention that thankfully the game was easy to code, but give yourself some more credit hahaha props to you because you made a very polished game!
I am definetely going to check PSXEffects after this, your game looks beautiful.
Even though you state on your game page that you struggle with level design, I think the level design on this game was just fine (so go easy on yourself!) and you did a fantastic job :)
The only thing I can think of that would make this game even better is to add some physics to the rolling ball, you know go faster on slopes and all that.
Congrats on a great game! (232180 was the best I could do!