I fired up this game after weeks of not playing it and realized why I got bored with it quick. It's mostly to do with the grinding. I was surprised to read about people running into a wall with Commander scaling, which is a big turn off for me.

Right now, the best alternative to KanColle (it's even better!) is Azur Lane: http://blhx.wikia.com/wiki/Azur_Lane_Wiki

It's everything KanColle should've been, without the obvious cash grab system that DMM slaps in your face. What's nice is that the system doesn't reward whales (not outright anyway), instead they make money from the costumes for your ship-waifu, and certain QOL improvements in the game (which you can get absolutely free with some elbow grease)

And the best thing is that you're not limited to just 99% IJN ships and a token western lineup (if you can even call it that). You basically have all of the ships from WWII, and I like how ships like the HMS Prince of Wales (in summer costume shown below) and USS Hornet are represented. Been playing mostly this game and Terra Battle 2 (time filler) lately, though I still check in with FKG a few minutes daily.