Can confirm. I'll go and try it on my desktop with 8 GB.
Edit. After clicking "Run game" (I have set the web based games not to autostart) my RAM usage jumps by about 2.5 GB (from 2.2 GB to 4.7 GB used). It goes a little higher still while the game is starting (mine peaked at over 5 GB used), but then settles back (at 4.5 GB used for me). It does like RAM!
Edit2. It does run though.