TLDR: A very good, more in the direction of Sekiro, souls-like game. It does not overstay its welcome, maybe even a bit too short compared to other souls-like games. If you are not a fan if this style of combat (meaning a willingness a specific combat flow) you will not enjoy this game. But if you do, there's quite some joy to be had with this one.

Slightly longer review:
Right of the bat, Thymesia leans more in the Sekiro direction, rather than Dark Souls. That is specifically true for its deflection/parry heavy combat style. Honestly, I was slightly unsure at the beginning if I like this game until I understood that deflection is key. So this game is more about learning a specific combat flow, rather than experimenting with different styles and weapons. If you are not into that, you will struggle with Thymesia :) On top of that, there is a 2-part health bar system. And you will have to find the right balance between regular and claw attacks to prevent enemies from healing. That obviously prolongs individual combat-encounters, especially if you have not yet mastered the system fully. But I found this to be a welcomed change to the regular formular, and I enjoyed exploring it.
That being said there's a lot to like here: The character feels good and responsive to inputs, there are beautiful sceneries with well structured levels, albeit limited to 3 different areas, and an ok variety of enemies. Yes, they are limited in scope (sth around 15-20 different types) however that worked for me since that allowed me to learn them well and feel quite powerful towards the end.
There is quite a varied talent-tree to experiment with, giving you some interesting options and an in-depth potion system which I honestly think should be standard for the next Dark Souls game. And on top of that, I think I had only one bug that was easily solved. Honestly, I am surprised of the quality of this game which includes the animation system which I found to be top notch.
Highlight, as in most souls-likes, are the bosses obviously. And just as in any souls-like game it's all about learning their moves and, in this case, get into a rhythm of deflecting and attacking.

So, all in all. Thymesia is a pleasant experience, an interesting take on the souls-like formular, high quality, albeit a bit limited in scope and I finished it in around 16h (the game is basically split in 2 parts, the second one being more challenging but also a bit more repetitive). Maybe a bit pricy for 25€ (here in Germany) but definitely a good buy in a sale.

a simple dark souls experience. 8/10.

What a game! Boosted visuals all the way looks fantastic. A bit of stuttering here and there but nothing game breaking... a typical souls like but able to have its own creative taste. Deff pick up when on special%