Well thought out game. I really like the mining and attacking in the water. While oxygen is running low it is quiet challenging. Eventually it became a bit repetitive. Still a really great game. Art and music good. For feedback I would advice to make a better transition between the sea area and land area. Also some coins are randomly place and appeared on the right side of the purple tentacle, which I couldn't reached. Pufferfish timing event works well and I especially like it that you gave the player the decision of choosing what to upgrade. Great game!