Cute little game!
I can feel the inspiration from katamari in this one, but there definitely are a couple of games that share the same core idea. Obviously the idea works very well with the theme of the jam.
I think that this game could benefit with a little bit more of the puzzle aspect of those games, where there is a small sequence of "what do I need to get to be able to get that?" and finding out if you are big enough to eat / absorb something. While the highlighting showing what you can and cannot eat is useful, I think it can take a bit away from the satisfaction of returning to a object unknowing if you are actually big enough to eat it or not.
Its interesting to have different enemies that chase you around, and I think it could be cool if were multiple sizes of them that played differently when you were at different sizes. Like if the dog in the original level didn't care about you until you got to a big enough size. Also, outright dying immediately can be a bit annoying in a progression game like this, so maybe experiment with other ideas like losing some of your size, or other negative things that aren't just a hard reset.
Having jumps be a part of your core movement I think could also be leaned into harder, where maybe depending on your size you could jump further. Which could lead to interactions like needing to be a certain size to cross some sort of gap, or not wanting to be too big so you don't overshoot some jump you need to make. Anything that can add more depth to the core mechanic of the game.
The art style is very cute! Although, I would look into making sure all the sprites you have are at the same pixel ratio, since (atleast for me) it can be a bit jarring seeing two differenly scaled sprites. (Namely the people and police dog in the city level)
Having a little story go along with the game is very nice, its always fun with these kind of games for the scale to get ridiculous until you are starting to eat planets and the cosmos itself.
The ending theme is also a banger.
Nice job!