I played co-op spelunky 2 online yesterday with my brother for like 4 hours and it was perfectly fine no issues, it looked 100 times better than on the stream
Man I love this game so much put many many many hours into it
Also Jan, Long sword is quick and in your face as well as the dual blades both are very fun I spent the majority of my time with the game using the long sword that is my main and I used the dual blades when my friend bought the game for Iceborn they are also super fun
Also tip with the clutch claw if you have a full slinger you can blast the monsters face if they are not enraged (with R2) and stumble them into a wall doing a large amount of damage and knocking them over (if they are not facing a wall you can turn them by flinching them with circle). Also when you are doing your normal attack (triangle) it will weaken that part of the monster making critical hits more likely.
Also you can pay attention to the monsters heartbeat (down near the minimap) to have a better idea how hurt it is it if is skulling you can trap it because that means it is close to death
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