No idea what's going on with the dev/this game, but I can tell you as a developer that Unity sucks;
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Any developer worth their salt, who watches someone fail to use their own product to develop stuff, using the normal expected methods, leaves. At high speed.
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So, if he's saying that the engine is rough to work with, believe me, he's not wrong. I truly don't envy anyone who made the mistake of going with them, especially if they're making something even
slightly unique.