I have to say, the preview looks really, really well made, but it kinda sucks that the demo is only for android. It's not too important really considering this game is clearly not a scam or anything, but having a windows port demo would be nice for convenience of getting to actually check the game first.
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Totally agree with you there, a demo would be great, but the main point of the Android version having a demo at all, rather than there being no demos, is so that android players can check if their device will run/support the game, since that's often a problem for mobile play.
And, well, you didn't hear it from me, but certain websites can get you a free version if you want to try before you buy. That's what I did, because this dev deserves the monetary support for this quality of a game.