Actually I don’t have any, because unlike Heart no Kuni no Alice, Clover no Kuni no Alice doesn’t have so many hidden secret information in the lover routes. The new world building is mostly done in the common events so playing one route before another wouldn’t spoil you for anything. However, there are certain routes in Clover that have some problems. (Personally I think they employed some new writers, because the plot and character development felt OOC in certain areas. Also many people started smoking randomly only to drop the trend in the next game) Depending on your preferences-whether you like to play the annoying first and get them out of the way or save them for last-you can choose your own order.
Ace- His route is HELLA dark, although It’s not actually OOC. His unstable behavior is mostly caused by the fact that Julius, the one who normally helps him retain his sanity, is left behind in the country of hearts. But still if you’re looking for some actual sweet romance and not a mindscrewy and codependent relationship, you won’t be getting it here ^^;;
Elliot- It’s the worst route in terms of writing, imo. Alice was extremely OOC here, creating meaningless drama over how Elliot and she shouldn’t date because they’re ‘boss and subordinate’ (Alice works as a maid and Elliot is the no. 2 in the organization), and emofagging over Elliot not loving her even though he pretty much drowns her with his affection all the time >.>
Blood- There is even more ex-drama in this route compared to Heart, and although the start and end of his route is pretty cute (the ending gave me cavities <3), the middle part is riddled with bullshit. Blood is extremely hung up over the ex issue, and Alice treated Blood like some cheating playboy (because his fangirls kept sending him gifts and trying to woo him, and in his insecurity he made the mistake of trying to use them to make her jealous) even though he had declared his intention to commit to her multiple times.
Gray- Gray is the perfect gentleman and a sweetheart here, but Alice is OOC just like Elliot’s route and kept emofagging over Julius (in this route she previously lived in the Clock Tower with him), making Gray feel like a replacement. She also kept whining about how she’s immature and not worthy of Gray, and dissed Gray’s sweet/romantic gestures as him just humoring her.
TL;DR Play however you want but brace yourself for dark stuff/dumb BS in the above routes