vs
QUICK ANSWER
"Too soon" is a phrase which is often translated as "demasiado pronto", and "too much" is an adverb which is often translated as "demasiado". Learn more about the difference between "too soon" and "too much" below.
too soon( 
tu
sun
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. demasiado pronto 
Step on the gas. Don't release the clutch too soon.Pisa el acelerador. No largues el embrague demasiado pronto.
b. demasiado temprano 
It's too soon to know the results of the elections.Es demasiado temprano para saber el resultado de las elecciones.
too much( 
tu
muhch
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
1. (quantity)
An adjective is a word that describes a noun (e.g., the big dog).
2. (quantity)
d. muchísimo 
A three-course meal? That's too much for me.¿Una comida de tres platos? Me parece muchísimo.