I am just not sold on Battle Ace. I am hurting for shelf space anyway. 
It's worth it.  A loose copy takes up zero shelf space and can be found for under $10.  The music rocks and it's a solid game for its genre. 
Aldynes!! I probably play that the most on SGX of all the games.
Funny.  From most to least, I play Ghouls and Ghosts, Battle Ace, 1941, Aldynes, Granzort.