First boss was the one with a bee head on the shoulder.
Second is, I forgot.
The third one that I can't beat is the old man.
Viewing post in The Driller That Will Unravel The World jam comments
Thank you!
He's actually a boss that you profit from not knowing the mechanics very well! Trying to use tricks doesn't pay off as well as going on the offensive and just charging and hitting, or being a bit more safe and using the shield. (However there's a secret turn end event where he puts on the bee mask (no sprite for him wearing it :c) and gets different stats and moveset, so he's simultaneously one of the easiest and one of the hardest bosses)