Super glitchy for me, and I'm playing on Chrome. The shower scene with Ana has provided multiple different glitches, but all have to do with Anna not appearing, and sometimes the bathroom background doesn't appear as well. But after about twenty minutes of trying, I got it to work, and the rest of the game is fantastic.
Also FUUUUUUUUCK HOW DO I GET MORE SEX SCENES WITH ANNA I CAN ONLY GET THE ONE AND I'VE PLAYED FOR LIKE FOUR HOURS IN TOTAL AND AM ONLY AT 15% COMPLETION