Hello.

I've been running Super Mario Bros for a while and in that game there are framerules, you may know them but if not: that game (SMB1) checks level completion every 21 frames or around 0.35 seconds. That means that you can only win or lose time in multiples of 0.35.

Does this game have framerules as well?

There are framerules, but not in the same way. Every frame counts for beating a level, but things like spinning your cape etc rely on framerules

So is safe to time my runs without the NTSC framerule add-on for LiveSplit? Because that's how I've been timing my runs.

Yeah, you don't need to have an add-on