Tactics Below

It's a simple but pretty addictive game. I like the pixel graphic aesthetic. Meta progression is based upon unlocking characters, passive items, skills, and potions, and not stat boosting.
I've unlocked all the characters and cleared up to Depth 6. While I haven't unlocked everything (skills, items, passives, monsters), the game that i have seen thus far I'd describe as 'casual but with depth'. In that, I mean you won't spend hours agonizing over decisions, and the skill tree/passive item/potion system in the latest update is cool. You really can have a different run every game depending on the skills, which seem pretty well balanced overall. That said, you can cobble together a set of skills across your party that might just barely pull out wins or end up totally overpowered! I have had failed runs where I didn't get the skills I needed or the party members didn't synergize as well as I thought, but figuring out those interactions is part of the fun for me. Multiple strategies can be used to conquer somewhat generic party-based combat scenarios depending upon your party which influences which skills you'll be able to combo. Common themes like turn-manipulation, buff stacking, debuff stacking, brute force damage, stun, aoe, single target skills, etc. will be familiar to experts and easy to understand for newcomers.
It could be improved (and I expect it will be) with additional party members/skills, monsters, and 'between fight' interaction variety. I don't think this game will be getting major updates (if the history is any indication) but I still feel like I got my money's worth.