Great work, little tips for the future tho:
-Movement feels unresponsive, slow and delayed, causing it to slide. Might be intended, but i didnt like it personally.
-Enemy spawning subs are weird, half of the time in terrain other half in your face or even on you.
-The whole concept of air didnt make sense since in the time I played I couldnt find a way to regain it.
-Felt a bit repetitive after a minute, but still you can explore and its procedural terrain love that!