yeah I agree, I would have done a lot more to make the game better and improve art, but I procrastinated to much early on and had to rush to finish everything. Also most sprites are 32x32 but that was to small so they got stretched during the actual game. This was so fun to make, and I'm glad you enjoyed it. This is also my first jam! :)
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Yes, I coded everything by hand, It was around 1700 lines of code. Maybe it would be better to use a game engine, but I have tried Unity and did not like how it worked. I used 'JFrame' to actually make the window and used 'Canvas' to write to it. The code is somewhat messy, but I could give you the source if you wanted.