Ehi there.
I tried the game 3 times, with 1 dead and 2 with the boss defeated. My main problem i think is the camera, because i usually can't see where i'm pointing and some camera movements seem really fast.
The enemy are usually ok. i don't understand if i can use the black cube actively, but for intuively i just used it as a shield. Once the enemy has the target locked on the black cube, it's easy to defeat them in the first rooms. The only room i couldn't use this tactic was the one before the boss one, because i couldn't see where they were and i chose to make them stop shooting instead.
The boss fight is a bit meh. 3 out of 3, i just stayed far and shot at it and it didin't attack. The time i died was because my control bar was empty. probably worth a different strategy, like a closed door after entering and a bigger aggro range.
That said, well done. Cheers