Both the combat and the platforming needs some time to get used to, but the gameplay is as metriod/castlevania-like as it could possibly be, promoting backtracking and freedom to explore. The intro is also very well made. I also like how the environment changes as you progress.
I can see that coyote time was implemented, which is neat. I would recommend adding jump buffer too so that it's easier to dodge consecutive projectiles. Being forced to use the spear in a safe environment is very helpful, but as many have mentioned, a longer 'lifetime' would be preferable.
I'm not sure what to do when I run out of mana against the second boss and stopped there, so never got to try out the air dash and am probably missing a lot of content, but I can tell that a lot of care was put into the levels and enemy design. Great job on the submission!