Trying to use my idiotic and childish brain here so dont blame me
You won't get special service by calling yourself an idiot.

BG music
you could change your players color (your player is always red why not another color)
new background
head texture (at least making a head ... or choosing one)
longer life
decap sound (when you get decapitated)
win sound (when you win)
lose sound (when you lose)
when you get hit sound (a sound when you get hit)

*when you get decapitated it will not play the "when you get hit sound