It appears that there was a slight issue in the jam’s version where it would start over after killing the first boss, while in the screen after defeating the boss it tells you that there is a level after it it wouldn’t show up.
So in the walkthrough video linked there is the whole game ALL THE LEVELS IN THE WALKTHROUGH ARE MADE DURING THE JAM.
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It appears that there was a slight issue in the jam’s version where it would start over after killing the first boss, while in the screen after defeating the boss it tells you that there is a level after it it wouldn’t show up. So in the walkthrough video linked there is the whole game ALL THE LEVELS IN THE WALKTHROUGH ARE MADE DURING THE JAM.