The Good Stuff:
The game concept is fun and the controls feel tight and "natural". Especially the sliding and wall-jumping. I liked the difficulty and how you have to think before challenging certain rooms and not just rush in with no plan.
The sound and art were great, felt good stabbing the air and the "meaty" sound of the boomerang made it feel like it had power.
Some (hopefully) constructive criticism:
Certain mechanics that make Metroidvanias enjoyable are missing. Due to the random nature of the game, abilities and weapons are not as well introduced as they could be.
I think the game could have benefited from being a bit slower paced, it feels a bit "floaty" when your character flies 1/3 of the screen away from an enemy after taking a hit.
Also, the game locks at the Game Over screen - don't know if that was a problem on my end or not.
Overall, I enjoyed playing the game! Solid 4/5 from me :)