Really nice game :D I kept playing till day 15 and was left with 73 dollars :(. Was kinda sad that the last few days were just big boxes and I lost money each day, but that's alright. The game fits the theme perfectly, delivering boxes and making sure you stack them right so nothing breaks. And the game was very fun too, I had a lot of fun making a text file and splitting the roads into 3 neighborhoods, so whenever I saw the address I could look at the file and see which neighborhood it belonged to. Also when there were a lot of fragile boxes I just set them all in the back and went off lol. The art is nice, was simple but charming and I didn't see any problems with it. There were however some problems with seeing where the middle and back boxes were, I couldn't tell if I had a box in a spot on the middle because it was covered by a box in the front. I have some experience working in Love2D(following harvard's course for 3 episodes), and I think you could've made the viewport a bit bigger and maybe show some depth by making the front boxes smaller than the middle, and the middle smaller than the back, that would've solved that problem. The sound effects were good, served their purpose, and I liked the music, very chill and nice, especially when I started a delivery. I feel like the mood could've been set better, maybe with a different kind of music, but it still gave me a nice cheery vibe while I worked on putting boxes in the right place. My main criticism is that it can take a long time, along with the slight confusion with where the boxes are, it also just took some time switching from front, middle, and back. Also think that if you don't set up some way of knowing the addresses and the neighborhood they belong to and instead rely on the map, the game would be even slower. I think some hotkeys would've been nice, maybe 1,2, and 3 for front, middle, back, and then M for the map, P for the package list, and U for the upgrades. And maybe packages could be moved to a spot by double clicking and placing them in the selected section of the truck.
Overall amazing game, with more time and polish I think a game like this could be really popular and fun, I already had a lot of fun playing this game so with more polish and more content and upgrades I would definitely play this game more. Could have more hotkeys and inputs to speed up gameplay and not make you dash around back and forth to click for the map and package list, maybe even making those lists resizable and draggable windows you can put around the game. I also like how it was made with Love2D, I don't know the engine very well but I do want to learn some lua incase I add mod support for future games, so you sharing the source code is very nice of you. Amazing job :)
P.S I want to learn how to make good pixel art so I'm gonna try Pixaki after seeing how nice your art looks o: