Known issue: The enemy lasers in Mode B spawn where they should at first, but as game progresses and there are less enemies on the screen, the laser seems to spawn lower than they should. The intention is they spawn 4 pixels below the enemy, otherwise they sometimes move down and spawn laser at the same time, destroying themselves.
And with the fix in Mode A, I can now recreate Nagoya attack. In Space Invaders, there's a bug (or a feature?) where enemy bullets spawn one row below than their position, so when they're at the bottom row the bullet will spawn below the player, rendering the player invincible. There's a lot of risk playing it this way, both in the original and in this version, but it's something I wanted to include in this version as I heard this was how the 'cool kids' played the game back in the days.