Hi Overtold, your post sounds quite interesting and I guess when browsing through my profile's comments, you could notice some of my game's reviews there :-)
For that added pic, I'd add thoughts like: Those walls do look awesome in 3d, while the textline "This is not a dream..." sounds interesting in its meaning, also getting me curious what hides at the destination of either the red or purple marked spot. I like the sky's colours and the general font/size/colour for text (also its font-type) looks okay.
That fire-animation looks bit bright in glowing-effect, while those flames look amazing in graphics/optical objects. that pistol looking quite "common" in design those bolts look not that realistic and just some shadows next to approx 2 colours (yellow/gold and black) sounds quite "okay", while I'd prefer animation like those wall's bricks (which are no straight surface and still looking nice even it's just either modelled in 3d or in 2d only).
"Find the cube of Astra" sounds cool as task, I like quests in general & I guess the lines being mentioned on the left or right side of the screen sounds like a standard-location? Maybe the "E to slow Time" could be referred as "E" in bold letters, while generally italic font in-game looks okay too. So far I can see just one type of text, possibly different font next to variety of colours cold suit too. I like that the timer includes a graphic which represents time, sounds simple still it could be useful to notice it, no matter if the game being in your first language or if you just like its visuals while text sounding less familiar in language. Probably I'm focusing on different details when feedbacking stuff, e.g. the "meters in distance" could be bit less big in size. And I like 3d-games with a character moving free, than just moving right/left, up/downwards only.