I think Snowflake is fine I guess, I wouldn't want my 4* to have only 7 power and risk in.
From playing against multiple Roots players in Elo, I find that players tend to put Treeman as a junk card. In that case, Flora could be a better alternative.
If you're keeping Snowflake, I suggest drop Gretchem and get Tuck since you're lacking in attack manipulation and you may tend to over-rely on raw hard power. Other than that I find it's a good deck to play with although I've never played anything like that so I wouldn't know