This is a fun concept!  I was very proud of myself for defeating those guys and was sad that the experience ended so quickly.  The breath-holding feature is clever and creative...and gave me anxiety!  I found the game easy to understand and fun to play, and I like having a mouse-driven attack.  Congratulations on doing this in such a short amount of time!  Very impressive.  And I agree that it has potential.

I was contemplating a similar concept before I switched to something else (holding breath), so it's cool to see an implementation of the idea. I feel confused as to why I permanently lose air, ie both the pickups and my resource in general, and why air would go down while my feet were submerged instead of my full body, but I understand this had a late start, and the spin mechanic (which feels more like a grapple) is fun.

W construct 3 game

nice! I really like the concept of using the breath for the countdown, and the underwater attack is super satisfying!