At this point I believe BrightScript is your only option (APKs are most definitely not supported). They used to have an NDK that allowed you to use C/C++ (other languages?), but I believe that's no longer an option and was pretty much reserved for special partners anyway. There was also some other game platform partnership, but I can't remember what it was and I don't know if it's still available.
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Yeah Retaliate's a great game. Midnight Divide (same developer) seems to have stepped up a bit of the overall graphics & feel of the look & graphics, but personally I find Retaliate has more of an 'arcade' style..
Thx for the replies. I've played several Roku games, but I remember reading where some apps were allowed to use low level tools other than Brightscript to code their games so I didn't know which games were designed using BrightScript. Looks like BS is very capable. Is there a better forum for Roku game development using Brightscript? Thx.