This really does capture the spirit of Katamari Damacy! The pleasant visuals, the dinky sound effects, the underlying dark humour are all well done. Thought the dialogue was a nice touch too, especially how when you get past a certain size it becomes too tiny to read and you're filled with pleasant thoughts about the smallness and futility of humanity!

The scale of the ball is conveyed well through the heavier and heavier inertia, but it would've been nice if you got the wonky rolling from Katamari working, though I can imagine that would be awkward to code. In terms of the overall structure you got the spectacle of building up from a grain of sand to rolling entire islands right, but moment to moment it could've used the Katamari trick of gating progress by confining the player to an area sealed by some roadblock. Felt like there should have been those kind of subgoals that daisy-chain all the way up to consuming the whole town.

Considering Katamari Damacy was made by a whole team of people in a few years and you managed this in a few days, I'm quite impressed!

I like the chaos in this game. 

It's chaotic, it's entertaining, it's fun. It lacks replayability, variety, and length/content. It is an adaptation of certain very popular mobile games, although I can't know how much these influenced you (if at all), therefore I would value it as a neutral observation. 

(Spoilers below)

I will attribute points for worldbuilding, narrative writing, and thematic choices through literary devices. The music and scenery juxtaposes the grim destruction being ensued. The horrific elements of narrative are foreshadowed through language used, i.e., the term "sacrifice" serves as a precursor for the underlying purpose of the players action. This element is reinforced and embellished by the surreal illustration of a giant smiling head which speaks ominously as it consumes that which you present it with (the souls and carcuses of the masses, their homes and vehicles, the very fibres of their economic, social, and cultural domains).