I like how you polished it :) The graphics and controls are nice.
Although the gameplay could be leveled up I believe, f.e. if you add some visuals around fallen barrels (like spreading oil?) so that when it touches the ice it starts to melt faster.
Also to make it less abstract how about add a helicopter as a main character we control?
It then could use different tools to clean up the oil and grab the animals.
Also animating the animals would make it more lively :)
And yeah, I agree with previous comments - a progression is a must have - maybe clearing up an icebergs set makes the heli fly to the next one, etc.