I have a bit of a bias against Java, though I will admit that today I tried out one of the first Java games that I have in a long time. The incompatibilities between the Microsoft and Sun JREs are frustrating to me, and when I'm on Windows I don't like messing with Java. On Mac though, it comes natively installed so it's fairly painless for me on that platform.
All that to say, yes I run Java, but I would still be interested in the game if it were run on Java (though I just like C# a lot better).
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Thanks for asking for feedback on all of this! I appreciate that you're looking for input from your users and seem to be acting on it so much.
You're probably already aware, but there's a tool for .Net apps called
Moma (Mono Migration Assistant) which will analyze your .Net assemblies and tell you what aspects of them are/are-not supported under Mono. You've likely already seen it, but just in case you haven't, I thought I'd point it out.
Thanks!
Respectfully,
clint