Thanks for playing, and thanks for the feedback!
I originally wasn't planning on updating the game after release, but yeah the game over bug with the bosses is REALLY bad, and it seems like it happens for every boss. I'm almost 100% sure it's due to me adding boss rematches last minute in a sloppy way.
In general it looks like a lot of issues stemmed from me being the only play tester for the game.
Once I get some free time I'll be sure to look into all these issues.
Again, thanks! :)