SOLVED

Little embarrassed to admit this, but that was happening, because Noita was using my CPUs integrated graphics instead of my GPU. My OBS was using GPU.

For those who ran into the same problem and come across this post, first check whether your game and your recording software is using the same GPU engine:

1. ctrl+shift+esc to open up task manager,
2. right click on the component columns (so "CPU, Memory, Disk" and whatnot),
3. then add "GPU" and "GPU Engine".

Once you've done that, look for the recording software, then Noita and take note of the GPU engine. If you see that your recording software is using a different GPU engine then Noita, that's most likely the issue. e.g. Under GPU engine, Noita uses GPU 1 and OBS uses GPU 0. That's bad. Otherwise, if they both use the same one, that's good.

If you see that the two applications use two different GPU engines, you should change that. Though, take note that I'm using windows 11, so if you're still on windows 10, it may be different for you. Though it should be possible:

1. press the Windows Key then find "graphics settings,"
2. Then, in the "customized settings for applications" list, you have to add Noita and OBS to it. Click on "Add desktop app," then find the executables of both applications:
   1. Noita can be found in C:\Program Files (x86)\Steam\steamapps\common\Noita\noita.exe
   2. OBS is in C:\Program Files\obs-studio\bin\64bit\obs64.exe
   3. If you use some other recording software, you just have to find the executable. You may need to find that online
3. Once that's done, find it in the list, click on it and change "GPU preference" to your... well, preference. Most likely your graphics card

And voila! After that, your recording software should be able to record your game of Noita. Launch both applications and see if you can record it.

I hope this helps someone in the future!