Fun & good game, lacking something
This is a fun and good game. The tactical elements are there in the game so much so that I made a smaller comparison with Into the Breach. It is crucial at harder to difficulties to pay attention to movement and what attack you want to use.
Graphics and the world is a nice touch, and the music is also great.
Game does not explain itself too much, but once you read through the abilities and the tutorial slides (takes like 5 mins, all in game, no alt-tab necessary) you get the hang of it and will check what to pay attention to.
However I think the game lacks some content. In 6 hours I managed to beat the hardest level (3 difficulties/team) with 1 team out of 4. There are also unlocks/upgrades you can buy, but those makes it even easier.
More teams or more options for characters in a team (as currently there is no options, just basic teams) could make this more replayable. Some additional difficulty or game modes could help as well.
These things can be fixed with patches. Hopefully more support is incoming.
Whether this is enough for you for 10-12 € is up to you.
Edit: After 13 hours of gametime I have beaten the hardest difficulty with all 4 teams.