Aye, Can I use previous save data for the new version of the game?
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Yup! Just download and install like you did the first time and the game will automatically read your save games :)
If you're on Win, Mac or Linux then you can delete the original game folder no problem and still retain your saves. If you're on Android, DO NOT DELETE THE GAME! Just install the new apk on top of the old one.
Hope that helps!