This shows a lot of promise. While clearly unfinished, this has the structure of something outside the scope of a short jam game.

A few things that need to be added (to the extent that these are obvious, forgive me, better safe than sorry):

1. More sound effects, and some music.

2. A better sprite for the player, depicting a character swimming (and pointing in at least 4 directions).

3. More hazards (scary fish?).

4. More features to explore (different types of resources? optional goals?).

Overall, very impressive for a first jam.

Wow! Amazing! 

This game have a really big potential. Keep it going mate.

Excellent work! I like the core concept of this and the upgrade system is awesome. Overall well done!

Good work :) I got 4 stars here,  a little bit of background music would make this alot better!

Cool concept, I collected 4 stars :)

Congrats! Keep It Up 

ABSOLUTELY FUN AND HORRIFYING GAME!

The concept is really well-designed, I was having a Subnautica and The Forest vibes while playing the game. The caverns are terrifying even without enemies/hazards!

I played the game while playing some cave bgm to ramp up my immersion and oh boy the tension just got amplified.

Overall, a very solid game! Looking forward on updates to this game in the future!

I collected all 6 stars before the sanity could drop low enough for the hallucinations to appear.

Oh man, I was surprised how much you were able to creep me out with such simple visual elements. I think that means you spent time in the right places :)

Balancing the health/sanity/oxygen was a nice touch, and your stomach drops with dread a little when you dive further and the sanity leaks away. It's tuned nicely so you have just enough oxygen to reach the next cave.

What was the money in the top right for and how do I get more of it?