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I'll assume R is secret, and is the key; and the ciphertext is given as a list of values x in decimal, as in the example given x = 0.559425856. This is totally insecure: even without knowledge of R, it is trivial to reduce candidate plaintext letters to almost nothing, just by knowing the corresponding x. e.g. if we assume R is an integer in range ...


As a add on to the above answer, it would be insecure to use $g^{x+y}$ as key , because both $g^x$ and $g^y$ will be transmitted publicly and by simply eavesdropping one can easily find the required key i.e $g^{x+y}$.

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