The best comparison is 2D fire emblem, or that one metal slime tank game on the DS. I think I’m about 2/3rds of the way done with the game. It’s decently long. The gameplay is in stages with your tank facing off 1-6 enemies. You have 3 slots available and there are 3 weapon types, machine gun, mortar, and cannon. Each kid has a specific weapon they use, as well as a special support skill when paired with another kid. They also have moves they learn by leveling up like pokemon, with kids learning unique moves or sometimes sharing moves but learning at different levels. The combat works by having a single timeline that both allies and enemies attack in. Lighter weapons deal less damage but are more accurate and attack faster. Each enemy can be delayed by using the right weapon type on them.
In between the combat you have rest sections. You get 20 action points, and each activity you do consumes a variable amount. You can cook, talk to each kid, do little side dungeons, fish for materials, and plant things on the tanks farm. Each kid will have something they want to do on each intermission, so the goal is to try and keep them happy by doing what they want. The intermission occurs between combat segments, but between each chapter you can also visit towns where you will get some free supplies, can trade your supplies, and get some fluff like a comic.
Overall it’s real good, though it quickly gets a bit stressful as enemies are able to tank hits and start doing shit like giving you status ailments, healing each other, and calling reinforcements.