Thanks for the suggestion, I'm still trying to figure out what's going on with the coin flip because I haven't been able to recreate the bug.
Browser version, windows 11, completely crashed on the first of each coin
Second time I rolled a negative spin, it half froze for a moment, I bought a few upgrades (whilst still spamming space) and it did some stuff (like actually caught a new fish) and the bad coin went away after a few inputs - every other bad coin after that was fine
And then it went back to freezing on the first good coin
Just lots of inputs, past that idk