The test fails too. A very small file of just one layout and event sheet, yet it's just a black screen for a few seconds (although the layout had a blue screen, as a test to see if it even shows anything at all of the project, the answer to which is now 'no') and then closes.
As for any more info I can think to provide that could be relevant: When exporting, I choose to Minify the script, Hide status bar, use WKWebView on iOS (perhaps irrelevant to Android which is my focus for now), not use new Intel XDK project format, no permissions, both audio file types just in case, Minimum iOS set to 8.0+, Minimum Android set to 4.0+ (Ice Cream Sandwich) [Crosswalk]. I also haven't bothered with the Construct 2 "Google Play" plugin, for accessing Google Play Game Services, as I figure that's only for online things like leader-boards and achievements; unsure if that's an issue. I also don't touch anything in Intel XDK, I just import the HTML5 from C2's Export and do the bare minimum of setting the App ID and certificate, the latter of which I don't think has to do with any specific predetermined 'keystore' retrieved from Google Play, just something made up; also unsure if that's an issue.
If anyone dealt with a similar issue, of your app just being a black screen and closing, please let me know what you think it could be, or what I may want to try or test first.
Edit: My next idea is to heed that message Intel XDK gives me about the plugins, and see if that helps.