Underwater 2D: collecting the necessary fish and oxygen in the depths
In Underwater 2D you swim through alien underwater depths and collect the necessary fish before the end of the dive. This is a game of skill. Oxygen is constantly decreasing, so you cannot skip the route to the replenishment zones.
How to collect the necessary fish
Move to W, A, S, D to guide the course to the goal and avoid hitting dangerous objects. Space or LMB gives you a hook that helps you grab the desired loot. Here, Gathering goes through an exact entry, and not through a random circle.
Where to replenish oxygen?
Oxygen is constantly running out, so look for replenishment zones in the water column. They lie right among the regular route, and not separately from it. First look at your air supply, then at your next target.
What's stopping you from going deeper?
Dangerous fish and algae are dangerous with one touch, so a direct pass is not always the best. Underwater you have to go around such places - familiar from Fish Story 2. Here the mistake most often happens on a turn, when you are already moving towards the next air zone.