Any chance of enabling Steam Leaderboard support? Most of your other games have had this feature, which is always appreciated in arcade games. But the most recent two games have excluded it.

Occasionally in-game some sound effects will get stuck in a loop. Almost as if the effect is not being completely cleared from the sound cache. This issue is very intermittent and sometimes clears itself up on its own and other times does not. An example would be the increasing heartbeat sensor (as the devileader is forming) getting stuck and continuously playing into the next level. Other times a portion of the explosion when the devileader dies can become stuck and continuously play into further leve...

There's another small bug I noticed. One of my scores got replaced by another one on the "immortals" tab. The score actually copied itself so it now shows twice.

Dear Hijong Park, Congratulations on your cute recreation of Sinistar. Please consider remaking Missile Command! Love, Tempest

Would be nice to see expanded volume controls for BGM, SFX, and VOICE in a future update. I love the computer generated voice in this game but at times its a bit hard to hear over your primary weapon firing. Great game btw. I think this is one of your best....