Save files should work on web versions, but there might sometimes be issues (I don't know how that is with godot, but I think I heard from someone that you can't upload a web version if you use C# for programming the game in godot, although I'm not sure if that's (still) true).
For the games on my itch account I just used gamemaker, which was pretty easy to get into imo, but I do have some issues with it. For example you can't really make 3D games (I mean, you can, but like.. same thing with scratch, making a 3D game in a 2D engine means you have to figure out rendering and positioning without help from the game engine which would probably be a big hassle). Also deltatime in gamemaker is pretty bad, so almost nobody actually uses it. (I don't know if you know, but deltatime is the time it took to render the last frame, which is used for calculating things like speed to work even if the fps isn't at a constant value (without using deltatime the game would slow down if you're at lower fps and speed up if you're at higher fps which is the case for most gamemaker games)).
Also it's cool knowing other people in the school are working on games that are not in roblox lol (I don't have anything against roblox, but it's just not for me personally).
And yeah I also don't really know a different way of communicating without leaking my e-mail on itch to give it to you :)