nice game but the need for air and food constantly is frustrating, the game window is also too small.
id suggest making it bigger and zoom in more.. add a map also.
increase the time needed for food.. or allow us to keep food in an inventory.
allow the ability to purchase upgrades such as better food / bigger lungs using the coins collected
allow the ability to attack/shoot creatures that will harm.
all of the above would do a lot for this game :)