It shouldn’t be increasingly hard to expand your gallery the more you play. This is extremely discouraging to players. You should instead increase the amount you are able to expand the more you play, therefore people investing their time into the game actually get something out of it.
Art should be without boundaries or limitations, in this game it feels like it gets increasingly hard to build the things I want to build because I can’t expand my space. I have all these ideas and things I want to do with my gallery that I can’t do because its so damn hard to extend it when it gets more expensive every time I extend.
It should be harder at first to get expansions to encourage you to work with the small space, it should not get harder the more you play. The system is backwards, things should get more accessible and easier the longer you play to allow you to be expressive and make use of the increasing amount of build tools you are given.