Another smartphone/tablet game based on the main classic arcade series of Metal Slug and the gameplay from what I've seen is a good one although I still have mixed feelings/opinions about spinoffs like this on mobile. I had played the previous mediocre spinoffs like King of Fighters 97 OL and Blazblue Revolution Reburning as well as showed the gameplay videos on my YouTube channel although the latter decided that it couldn't work anymore quite smoothly on my tablet by taking up more resources than ever and I don't know if migration of the game progress from one device to another works since I've never done that before. I might have done data migration from one computer to another over some hardware trouble like the defective laptop AC adapter for instance probably due to the home retards' retarded influence like I don't know what their motives are today as if they're full of seeds of public troubles that are bound to happen without my or their consent.
Release date-wise, I was already too late to blog about Metal Slug XX Online but it seems that people are already more interested in the PS4 port of Metal Slug XX as Metal Slug XX Online was already released last year. The concerns I already have about Metal Slug XX Online include the whole stage (which is called the chapter) from the actual Metal Slug games divided into short-levels, the inaccurate movements of stuffs as well as the choppy sprite animation for effects and lastly, the level-progression type concept where you get to go through tons of levels in the game. I don't know what kind of reason they have in implementing that concept like trying to increase the replay value for smartphone/tablet games.
The positive parts, remade HD graphics along with music taken from Metal Slug XX and you get to deploy multiple playable characters although you can play as one of them on screen. Unfortunately, when it comes to modern graphics, people are like complaining about them as if they prefer the old-school graphics. It may be the case for Metal Slug series but with the upcoming Megaman 11 for instance, that is where things have gone next-gen but again, there's no guarantee in my opinion when it comes to a change like a switch to modern graphics.
Needless to say, I'm not a goodie at run-and-gun games and I can guess that even the mobile spinoff, Metal Slug XX Online, will be quite hard in further levels and it will be a big time-consuming game just like other games on smartphones/tablets are with tons of stuffs that increase replay value. The real danger to one's behavior is again, the Microtransaction + Loot-Box features in mobile games as well as the large amount of mobile games installed on your tablets/smartphones or both. I actually completed like some of the mobile games in the past but there are other mobile games I still have to complete.