I've been meaning to get Dimensions, but every time a sale happens on the google it's the wrong time. Speaking of mobile, quite a lot of games are underrated because people either don't want to pay or think the entire platform is about freemium shit. Here's a messy list:
-EvoCreo: I struggle to call this a Pokemon clone because the devs actively attempted to fix issues with Pokemon while making it, giving them one over Game Freak. It is though, and it's a very good one. There's DLC but it actually adds to the gameplay.
-Uciana: It's about the best 4x game on the platform, and it's updated pretty regularly. Definitely takes a lot of inspiration from MOO and you can't go wrong with the price. If you want something more like Master of Magic there's Planar Conquest, but it's quite buggy and no updates are around (consider running MoM in a DOS emu instead or going to your PC to get something like Age of Wonders Shadow Magic).
-Pocket Tanks: It's one-on-one Scorched Earth but much crazier in weapons. The IAP is kinda weird but worth it because of nuttier weapon choices, similar to my earlier Tales of Maj'Eyal post than most other mobile games. Also on PC and Mac, it's the same game.
-Great Big War Game: A title in a series of games heavily inspired by Advance Wars, but in 3D with more stuff like terrain height. This is the peak of the series. Unless you prefer under half the actual campaign length, randomly generated maps, and building your base however you want, then you want Epic Little War Game.
-Ticket to Ride: Well, just about all of Asmodee's boardgames are worth it (pathfinder being the exception), but Ticket to Ride is the best of them. Multiplayer links with all versions, the UI is nice (on a tablet anyway), and it's generally a good and wholesome boardgame besides. There's IAP, but considering that each one would be a whole other game physically I'm not opposed to it. Also notable is Talisman, but prepare to spend money if you're not me and have been buying expansions over the years. Also people tend to get mad about dice rolls, but from here it just sounds like salt.
-King of Dragon Pass: I prefer the updated version on mobile as opposed to computer because it was obviously made for it. It's basically a streamlined version of the original game (meaning a lot of micromanagement is now on full auto, this is a love or hate thing). KoDP is underrated in itself and is definitely a great play.
-Galaxy of Pen and Paper: The spiritual sequel to Knights of Pen and Paper. Just as good if not better, in spaaaaaaace. Don't play Paradox's actual Knights sequel, it's garbage.
-Cyber Knights: Trese Brothers' games are all damn good if they're what you're looking for and the devs provide great service, but this managed to capture the more open-ended Genesis Shadowrun type of game that the newer Shadowruns didn't do. Also notable: Templar Battleforce, Heroes of Steel, and Star Traders.
-Fighting Fantasy Classics: Tin Man Games makes by far the best gamebook adaptations around, with the only ones coming close being the Sorcery series and Lone Wolf Saga. This app is a sort of library with most of their Fighting Fantasy collection plus some new ones with extra options (original art, background music options, etc.), and additions are to come. As a free library would imply though, you must buy most of the books. It's also on Steam, but considering these are books and presented as such you should play this on the platform you use for eBooks.