As unfortunate as it is, more 16-bit games are broken than not. Most of those infinite milking possibilities stem from destructible projectiles/goons, a few have endlessly repeatable checkpoints, and a handful loop forever with no/marginal increase in difficulty. This does not only affect console-exclusives (Battle Mania (Daiginjou counterstops no matter what, too), Cho Aniki, Coryoon, Curse, Darius Force, Eliminate Down, Gleylancer, Gunhed, Musha Aleste, Phalanx, Power Gate, Rayxanber III, Soldier Blade, Star Parodier, Super Aleste, Thunder Force II & IV, Twinkle Tale, Undeadline*...) but even arcade ports (Area 88, Heavy Unit (MD), Parodius Da! (both PCE & SFC), Phelios, Task Force Harrier EX, Vapor Trail, Viewpoint, Zero Wing (MD)...). It is equally funny and tragic that some of the worst games are unaffected by such a flaw whereas some of the best are irrevocably tainted.
However the case may be, would you wish me to change your score to 999,990, Ex_Mosquito? You did get that result, after all. Down Load 2 does not have such a problem at least as far as I know. How regretful it is considerably worse than the first Down Load.
*I know, technically not a console-exclusive.