if you press window + G, you can record gameplay, and my computer is really crappy, so i don't think OBS would work, but that recording is good. any tips?

What tips are you looking for? If you have a solution that works good for you, what are your concerns?

I’m pretty sure that that capture method doesn’t let you build any layouts or anything like that so you probably won’t be able to capture LiveSplit or any other timer alongside the game, but if it works and gets you the video you need to submit a run then I don’t see an issue with it.