I really liked the atmosphere in this game, deep sea creatures are always fascinating and it was cool to be able to explore the ocean. Obviously there's polish that needs to be done all over the place, with clear player feedback being probably the most obvious, but after I got used to the quirks it didn't really matter too much.
The only thing that really threw me for a loop was that I think some of the text for the hints is off. A few of them had incorrect depths and it made me think I'd have to drive all the way back to near the surface to find them (the one I remember most clearly said "800" when it meant "8000", but there were others). However, I kept going down because I was curious and ended up finding all the animals.
Beyond that, the mini-games were mildly hard but fair and it was fun to "battle" the creatures in that unique way, rather than just trying to catch them (which initially was what I was trying to do, instead of clicking the "Lure" button).
Overall great job, it would be interesting to see a more polished version of this game!