Fun game! Haven't played something like that in quite a while, so that was a pleasant surprise. Music and art is great, made for terrific mood and I was scared the entire time haha. There's some slight design choices that i felt weren't the right ones, but it didn't stop me from completing the game, overall it's pretty solid and definitely a big achievement for someone that just picked up a game engine iirc.
So I for some nitpicks about the design, I wasn't sure what corelocked meant at first, later I realised it's a different name for classic overheat situation, I felt that with how your bosses were implemented, it's just a punish mechanism against players. I wouldn't be against it if your bosses didn't have timed window when they can take damage, if you screw up with overheat you're denied the opportunity to fight. That's my first thought about it, the system probably just need some value tweaking to feel better, but it's aight at the moment.
Thanks for making great game! :D