I gave it another go, thanks for the update.
I noticed one thing: the enemies' hitpoints increase over time. That's a good thing, since it increases challenge too, but the fact is that you don't know exactly how many hits an enemy will need to be killed, until it's dead. So you could use some color coding, or any kind of coding, to make it visually clear how much an enemy is powerful.
Last note, I'd make the guy in the top right of the shop killable. Not really important, but it's an unnecessary, small and funny detail that would give a laugh to anyone who found it (and also some satisfaction for finding a secret)
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Haha man thanks a lot for both suggestions, especially the one about the merchant. At first I want to hide an easter egg about Charon from Greek mythology (actually Hades The Game easter egg) but I did not have time to implement it. I'll think about this fun secret you offered to implement.
By the way, what abut to reach each other out? We can contact via e-mail or Discord, if you want.