It was missing blaster? Could be a fun megaman style game here, it was missing the "MEGA" about it though without an ability to attack? I have to give it some loss of points for this.... 

3.0 

Looks like you did a lot with it and good attempt overall with everything else.

Congratulations on your first metroidvania. It was also my first one. So, I can relate.

I had troubles beating your game, since I could not shoot. Your instructions say "alt", but I tried every key on my keyboard and it just did not shoot.

Fun! But it's really hard to control my player movement. Cool concept on surviving with O2

NICE! yes, the idea of a Metroid Vania under water is something I really want. There are some issues in the game like too much acceleration in player's movement and wall jumping is hard to do. 👌

Cool game! I like the NES-style used for the game! Good job!

Pretty fun, but the character movement is too slippery and the character looks too much like Mega Man X