As with any zip file from unofficial sources, there is a risk of malware or corrupt files. It is highly recommended to scan the file with antivirus software before extraction.
Files labeled with "FLRK" may also appear in hand-curated arcade sets like the FBNEO 1.0.0.3 Best Set, which includes BIOS files for better compatibility.
The original arcade version was famous for its unique rotary joysticks that allowed you to move in one direction while shooting in another. Most home ports (NES, Atari, MSX) struggle to replicate this, often resulting in "infuriating" and sluggish controls where characters must walk in a half-circle just to turn around.
Many reviewers note that the characters move at a "snails pace," making it nearly impossible to dodge the heavy volume of enemy projectiles.
A highlight for many players is the ability to commandeer tanks, which offer increased protection and the ability to run over enemies, though they are often "weirdly difficult" to enter correctly.
If you are using mobile apps like "Zip & RAR File Extractor" to open the .zip , be aware that these are often criticized for excessive ads that can make the app nearly unusable.