Couldn't get the game running unfortunately. DontCollide.exe in the root folder said "java runtime environment" was required. And DontCollide.exe in the Windowsx64 folder just didn't open at all.
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Okay, I'm fairly certain that the JRE being packaged with the game is just not correctly being associated with the .exe and .jar files. I will have to investigate the various settings both in the game engine's sdk and in the Launch4j program to find a process that works for future deployments!
I appreciate you taking the time to respond :)