I like the second design better too. with the more tomboy-ish nature and I also prefer the first one's hair style as well, but for me I think keeping both the hairstyle and color of the first one would look great! I like the contrast between the black hair and neon green highlights.
You can copy the save file of the game and put it some where else in your phone.That way you won't lose your save and then you can just put the save file back in the game's folder after you install new version.
I'm just interested in your game at first and so i decided to give it a try and sure enough the game was extremly fun bcz of all these comedy and sexy things in the game and most importantly there is a girl wearing Shin Getter Robo jacket! This game is pure gold right here i'm telling you.
It happen when the mc open HUD to see girl's information i don't know why but it brutally lagged when the HUD came up(almost freeze really) so i wonder if you can fix this plz, i really like this game... (i'm using mobile version)
