I can promise you that your comment will not stop me for enjoying the game!
We play this game now in the C64 Hiscore challenge.
For June we played Starforce. If you select sfx there is no in game music.
In Mai we played "Xerons" No in game music.
2 great games!!
Others
Zybex, Scramble, Bulldog, Parallax, Gladiators, Sanixion, Subterenia, Zaxxon, Delta, Slayer, Uridium, Zynaps, Armalyte
A lot of the games I mention here even got crap sfx.
Armalyte as many consider the best C64 shmup got nice sfx and with music it could not been that good sfx. I would not change it for music and 1 channel sfx.
R-type got great music but the sfx is crap. Hard to play that way. I get almost no feeling playing the game. Much better on Amiga but there you got 4-channels.
Not saying it is impossible with sfx and music.
Sarah Jane have done it great on C64.
Soul Force, Zeta wing comes to mind.
Nice that you buy and enjoy retro games :)
I buy most C64, Spectrum and Amiga games.