Pretty neat game with a cool ability it is centered around! It took a bit, but in the end, I felt like I was a Titanfall 2 pilot, phase shifting in and out of dimensions: popping out at the exact position to throw some enemies around, only to pop right back into dark subspace when they start shooting. Felt great to get used to the fast and frantic play, scrambling as I dimension hop, memorizing the enemy positions for maximum effectiveness when I pop back out.
Definitely had a rough start with this game though. The main menu is really drab, annoying to navigate and is confusing with its language. For the gameplay, movement was a bit sketchy and weird, especially with the jumps where, among other things, jumping up through a platform would have you impact with the platform as you pass through it, even though you hadn't finished your jump. Finally, I don't feel like it introduces the concepts, especially the ability, in an effective manner, as I had no idea what it did at first besides make everything dark. The level the ability is introduced in does nothing to explain it: maybe create a level where you're locked in and shot at with no way around normally, but the ability instruction is there, so you test it out and realize you can go past the bullets. Also found it weird that some objects you throw you can keep throwing forever, but other objects can only be thrown once?
I think this game has a really cool concept to it that I'd love to see polished up and fleshed out into a big game: I feel like it's really got legs. Could add a whole story element to teaching the mechanics: maybe you're an escaped experiment or something like that. Would absolutely love to see a Katana Zero-esque replay when you beat a level, where it edits out all the time you spent in the dark dimension so you see what the enemy sees, where it looks like you're just instantly teleporting around causing chaos!