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(+1)

Are there more than the 3 enemy types or is there more to fight after day 5 that I dont know about? 

It just seemed like all there was to do was upgrade items at this point, but I could be wrong. Not sure if the town changes or whatever or something new happens after upgrades or not.

(+1)

You're right, it's mostly just increased monster waves at night, upgrades, and some changes to NPC dialogue.