The incredible RatporMelon has written a comprehensive guide on installing fonts on your Steam Deck, in order to fix an issue where battle numbers and other elements wouldn't appear correctly in 8-Bit Adventures 1 on the system.

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3343674792

I'm immensely grateful to RaptorMelon for this, as it's been a commonly reported issue. Unfortunately, I haven't been able to fix it on my end, and because I live in Australia, I was unable to directly buy a Steam Deck for testing.

So if you want to play 8-Bit Adventures 1 on Deck, this guide should help you have an optimal experience =)