Graphics issue

To fix this issue. Fully close the Pico-8 after load the game up. Load the game again. All fine after that.

Whoa seems like your initial issue ignores everything drawn with one-off characters + is messing up font data.
Basically everything which is defined using the full p8scii 0-255 charset, only sprites and map data seems intact.
I have the same version, loaded both ways using load #thunder_castle-3 and from splore but it worked. I have no idea what could cause this.

Linux version. pico-8_0.2.6b_amd64

I'm using Nobara OS Linux to run it.

favorites.txt

|thunder_castle-3 |thunder_castle |1794 |heracleum | |thunder castle for pico-8

First time loaded. Fixed when I reloaded the pico.

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I deleted the cart, hera_thuncas02.p8d.txt and the temp-thunder_castle.nfo. Tested the game again. Look like it got fixed fully. :)