Well, it's easy enough to change the quantity of tiles that come up.

$4BA1C: C9 16 F0 06

change this to

$4BA1C: C9 XX B0 06

Where XX is between 0 and 0x16, and represents the number of tiles it forces to spawn out of the floor. This will cause the FlyingTileFactory overlord to self terminate earlier than in a vanilla rom.

Code for reference:

Code:


    ; *$4B9E8-$4BA29 JUMP LOCATION
    Overlord_FlyingTileFactory:
    {
       LDA $0B08, X : CMP $E2
       LDA $0B10, X : SBC $E3 : BNE .outOfRange

       LDA $0B18, X : CMP $E8
       LDA $0B20, X : SBC $E9 : BNE .outOfRange

       DEC $0B30, X

       LDA $0B30, X : CMP.b #$80 : BEQ .spawn_flying_tile

       RTS

    .resetTimer

       LDA.b #$81 : STA $0B30, X

       RTS
    
    .spawn_flying_tile
    
       JSR Overlord_SpawnFlyingTile : BMI .resetTimer
        
       INC $0B28, X
        
       LDA $0B28, X : CMP.b #$16 : BEQ .selfTerminate
        
       LDA.b #$E0 : STA $0B30, X
        
       RTS
    
    .selfTerminate
    
       STZ $0B00, X
    
    .outOfRange
    
       RTS
    }