I've been playing this quite a lot recently and have really enjoyed it on the whole.
One thing I think could be improved is that the singles once released don't appear to be viewable again. You can see what the lineup was and how well the song did, chart position etc. but you can't see what the genre was, the style, the lyrical theme. (You can only view these when it is in the charts).
Once a song has been selected to be part of a concert you cannot view its demographic appeal anymore when clicking 'add song'.
During a concert, if the background music could change depending on the song/genre being performed that could be a nice little detail.
The 'No critical failure' card did not seem to work for me during a concert.
I think it would also be good to have the option of putting certain songs onto an album, so getting the team to write album tracks that cost less to produce but with some singles on there too. This would be a nice occasional addition alongside the elections, concerts and world tours. Maybe even an extra option of 'shooting a music video' for certain songs where you have to temporarily hire a camera crew, director and editor...this could also make the stylists come in to their own and add dimension to their roles and create more things to learn under 'research'.
Occasionally having songs being picked up by advertising could mean extra revenue / royalties from a single after it has been released.
At the annual awards would it not be slightly more realistic if there could be the possibility of scandals / problems during the ceremony? Also a feature where you have to prep the idols for the awards show and choosing certain outfits that may create more media reaction could again involve the stylists more.
Also during a world tour it seems nothing can ever really go wrong. There could maybe be small mishaps like arguments, getting held up arriving into a new country... etc.
- - - glitches / bugs / other stuff - - -
There is an annoying glitch during my conversations with idols (usually casual) where I'm getting a flickering of colour on my screen - I know it's coming every time and it hopefully can be fixed.
I noticed that sometimes Idols that have long been graduated can get mentioned when trying to find out who is in a clique etc.
Hovering over the number of fans brings up the demographic breakdowns - could this text not be a bit larger / fill a page like with salaries and contracts?
Being able to change the order of your idols as they appear on the main screen could be useful.