Love and Deepspace
I absolutely love that game. I think that they did a great job with the mix of dating simulation and combat system. The principle is pretty similar to Obey Me; there is a gacha system to have cards, and you need to level up those cards to win your battles. I am a F2P player and I already have a lot of 5 stars cards. The only issue with this game is the energy and the XP. You will need a LOT of XP to level up your cards to the max and this cost a lot of energy which take times to replenish :(.
But, this games also have other features like card games and also claw machines, which is very fun. Thanks to your cards you have access to secret times and tender moments that you can listen to even if your are not in the app. News features were also added recently; this is called "Quality Time", allowing us to work, study and workout with the boys!
I have to say that the music of this game are very good!
My favourite musics are "Gravity of Spacetime" and "The Deep Sea".