Hello, if you have played Endless frontier before, it is quite similar but with much lesser features since they are still new. But I expect similar mechanics to be added in the future.
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The current game version is available on apkpure right now so maybe you can see if it's available https://apkpure.com/metal-slug-infinity-idle-game/com.ekkorr.msf
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It really is an idle game with not much input, approx ~30mins of gameplay twice a day I guess. There's a linear grinding aspect in the sense that u have to grind for units - fixed amount per day, but lesser gacha mechanics.
That looks cool. Maybe you could give it a try to some models I made for 3D printing(Sv-camel and Fat Marco) they're free on cults https://cults3d.com/en/users/oscartovarm/creations, if you print them send me a pic!
It's the most recent first-party MS title. A mobile freemium tower-defense-type deal that incorporates very nearly every character and enemy to've ever turned up in the series (... plus over a hundred additional waifus, I kid you not). Been in active development by SNK for years now, and expands on the lore of the original series quite a bit.
Google Play / iTunes / /r/MetalSlugAttack
Fair warning, though, freemium games are for those with either a lot of patience or a lot of money. MSA plays entirely differently to the regular Metal Slug titles - but if you want to see sprite art from the series, it has a massive library of the stuff.