Aquariums: First aquarium! What do you think?

This is my first ever aquarium, I started it about 20 days ago, I’m very nervous and I don’t wanna mess it up… what do you guys think?

It’s a 10L with just a light and filter with: a couple of Anubias (a big and a nana) that are doing fine and already started sprouting new leaves, some Duckweed that I keep separated (it covers about 1/3 of the water surface), a Marimo and some little Pogostemon that are probably not even visible in the pictures cause they molted and I’m not sure they’re alive, but I can see the roots have grown so maybe yes..?

It’s still cycling and now some algae appeared.

Do you think this is suitable environment for a ramshorn? I think a red one would make a nice contrast with the green.

Also should I add just one or is it doable to have two without them filling the tank with babies?

Should I add more plants?

And do you like it, or have some advice on how to make it nicer? I like it a lot, it’s very simple but it’s my first ever and I didn’t wanna overdo it, but I really wanna improve so please tell me your opinions!!