I am playing Yellow to finally complete that "catch em all" challenge. Currently at the point where I can do that Mew glitch, currently only have normal Pokeballs which is a fail so meh.
It may just be me but Squirtle and Charmander mouth/eyes seem a little dark compare to the other two. Not really criticism as it turn out great and I assume you have your reasons for choosing those colors but Bulbasaur vines though forming a heart which is very cute don't really make sense. Where the vine going right coming from?