My first impression was that the game reminded me a lot of the legendary old Flash game N (The Way of the Ninja) — in a good way.
I liked the trailing lines in the background. It's a nice visual effect. The music is also pretty good.
The Z/X controls felt terrible at first, but once I realized I could use the arrow keys for movement, things started to make more sense.
One thing that felt a bit illogical was that doors I'd already opened in a level would close again after I died. I expected them to stay open.
Overall, I enjoyed the game, but I don't think this genre is really for me. The gameplay requires fairly precise timing and coordination, which I struggled with. For example, I couldn't always use dashes or double jumps while sliding down walls (or maybe I'd already used them before reaching that point — I'm not entirely sure).
I understand that these limitations might be intentional and make sense from a game design perspective, but they made the game quite challenging for someone like me who isn't particularly experienced with this type of platformer.
Anyway, good luck with the game!