There's no challenge. You'll only die if you're actively trying to get killed and you're healed at the end of each wave. Pretty colors and a song are not the entirety of a game.
The second boss is only annoying if you're trying to kill him with your fists.
It's more efficient to throw the spear and then pick up whatever weapon you already had, and since he runs at you, you can throw the spear from where you dropped your weapon and immediately start attacking.
 "Pixel 2"){kind=tracking}
 "Cactus McCoy 2"){kind=icon}
 "LARRY and the GNOMES"){kind=icon}
 "Hack Slash Crawl"){kind=icon}