Great art style, it looks fantastic! Both options have their plus points, but I think you need to pick one or the other and commit to it.
If you want to go purely text based then you could return to your original idea and tone down the detail in the background scene so that players clearly understand they are only interacting with the text. Or, if you want to go for interactive menu then make sure players won't wander off and try and click on things that don't do anything - for example, can I walk over to the calendar and click that? If the staircase is 'Play' and the table is 'Options' then consider only having those two items in the scene so players aren't confused.
Best of luck with your game!