I sideloaded Heavy Drinker via Website too and got the exact same crash reports.
The A+B+Lock+Menu did work for me. When you hold those buttons for a while it will say on the screen to press Lock+Menu to install recovery firmware or something, so you need to let go of A and B and only keep holding Menu and Lock.
I copied and deleted the data folder and game folder trying to fix my seemingly bricked playdate. I got a different crash report in the end with only the "settings"-tile beeing displayed after each crash. I missed taking a picture, something with "#1 colour nil".
But after letting the playdate sit for an hour or two i came back and it showed on the lock screen "new update available" and it was working again. Could update to newest firmaware, install all games again and copy my savegames back in the data folder.
So try to get that recovery firmware installed with the button combo and then let the playdate sit for a while till it gives the "new update" on the lockscreen.
Hope you can fix it and maybe we should warn in the discord about heavy drinker i think (or is it just us and we made something wrong?). I was relieved when mine stopped crashing.