It did work on windows ;) There was a bug with the restart function, the timer was there, but no balloons. I think c# web publish is planned for the next godot release.
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Yeah - I ran out of time to fix those bugs - hosed the level switcher right before submission and that broke a few other things. The balloons don't freeze after the counter, the timer should reset every level etc... And you found the restart bug :D All easy fixes, but don't want to mess with the Jam rules, GD.tv are monsters!