Hey that can be done with a square wave with the envelope set like a pluck and then shaped with an LFO if you want, although you don’t need the LFO if you set the envelope correctly. Then it has some kind of modulation on it like chorus, and def a plate reverb with a very short decay time and a little pre-delay. Then I believe they resampled (bounce in place), and chopped the samples, adjusting the length of some, and reversing some. This is what I hear personally in the sound design. That being said there are different methods for similar outcomes. Hope this helps.