Dang this game is pretty cleverly designed. You focused on one idea and really designed everything around it. The level feels really different depending on how many candies you take. Love the Portal reference too (even if it is a decade old :P)
I really like the art style and music as well!
I think my main issue is that at some point, aside from score, there isn't much incentive to keep collecting candies. I think maybe if after 5 or maybe 10, you could get bigger bullets too, that would be pretty neat. So, yeah you're big target, but you pack a punch as well. Pun intended.
I wish you could expand this game into a big overwolrd will multiple dungeons/levels. So NPCs and the like react to you differently depending on how much stuff you pack.
You could go in dungeons, and the more candies you get, the more you can sell in towns later and get upgrades, but the bigger you are, the harder the dungeons get as well.
I think enemies should be a little easier to deal with as well, with slightly bigger bullets. Was difficult to keep track of them because they were so tiny (though I get why you wanted them to small)
With some more polish and levels this could really be an amazing game.
Great work! Hope to see you in more game jams! :D