Is there a difference buy from here and from steam?
The main difference is that if steam went offline rn, if you download it off itch, the game is yours to keep forever. Steam is great don't get me wrong, but if you can download like the official .exe file I would do it that way and move it to steam. Remember steam doesn't give you the official .exe of the game so if steam went offline EVERY SINGLE game you have ever paid off steam is lost forever.