Dealt with it, it was an issue with old g*dot version refusing to regrab focus onto game iframe.
Now you can grab focus with mouse and it will once again accept keyboard inputs.
Viewing post in Dragonslayer FRPG [combat demo] jam comments
Great! Got it working. The first time through, I broke the combat system by flailing and pressing too many buttons at the first set of attacks. I tried to reproduce it but I wasn't able to. I tried again and got the hang of the battle system. I feel like there's a lot of depth there that could be explored in a proper tutorial. Loving the aesthetic and audio so far, keep it up!