If you like anime, grid-based tactics remniscent of Battleship, and a fun mixture of humor + cuteness, you will really enjoy this game.
There is quite a bit of text to provide the story in between battles, but I - admittedly - have skipped through it because I always want to get right into the next battle. The voice acting is in Japanese and the music and aesthetics provide a nice anime-feel with the cute, cartoonish character models and backgrounds.
The learning curve is fairly marginal for this game, as the tutorial helps you understand the fundamentals of the game very quickly. It is important to remember that every unit dies with one hit from any other unit (think Battleship, and all your ships cover only one grid point).
During the preloadout screen, you can deploy your troops in the allotted grid space. To field troops, you have to pay credits (at a very reasonable price compared to your post-battle loot, which means grinding is very balanced) to train them. In order to unlock the next tier of troops, you must research them, and they will be available to train after the next battle. There are also modules, which are either persistent or one-use equipments, and you can also research new modules and build them in the pre-battle setup. Some examples are permanent modules that allow your equipped character to move +1 extra grid space or have +1 improved range for their attack, and and example of a one-use module is a long-range scanner that reveals a large chunk of the grid map (also with a vast range).
The troops you can deploy include a commander/general unit (killing these units end the game in victory or defeat, so fielding more may be beneficial) that also provides a "connection" mechanic to every human tank. A general's connection speed determines how fast or slow it will take for your units to be "connected," which makes them active and allows you to issue commands to them.
There is a shock trooper unit that self-destructs to do damage to all grid points directly above, below, and to the right/left.
A recon unit can scan an area, revealing any enemy troops on those particular grid points. You reveal grid points on the map by scanning with the recon (other units can recon, but at significantly less efficiency [ex: artillery can only reveal 1 grid point, at a very short distance]). Your units also reveal a small radius around them, so moving them will provide holes in the fog of war.
There are general soldiers that will be the stormtroopers of your army, advancing rapidly and attacking at a short-medium distance.
Artillery provide long range support and are very useful when synchronized with careful recon scouting.
As you research and unlock higher tiers of each unit, you will notice numerous things improving like total movement points, attack range, and ability range.
You have the option of replaying free battles or continuing with the main story. Grinding is very quick and easy in this game.
The game has a lot of charm and humor, and it does a great job and making you feel like you are in an anime. In between battles, there is even a short intro/theme song sequence that is pretty funny. There are also those ad-style pictures that come before and after commercials in an actual anime. The voice acting is very anime-style, and characters will express themselves when they attack or die.
If you are a fan of grid-based strategy and/or like anime, then you should definitely give this game a try.