Death Adder spamming jump attacks on you as soon as you get close enough is actually the reflection of the playstyle more than 90% of players use. No wonder he's considered as one of the most toxic bosses in video games history
The 'bad end' just only shows that the players didn't retrieve the golden axe and just says "The End" or the 'good ending' is different it allows you to face off the final boss twice and the ending somehows reveals the players obtained the golden axe results the game's true ending epilogue and staff credits