When you stop on this special tile with the red cross you can recharge your life if you're hurt.

In the back of the gun , there are 2 Separate indicators : the first one indicates the shots that are inside the gun and and icon corresponds at the dots turned on or off It depends on the shots that were used, the second one is the green line that represents the state of the battery to be able to use special ability .
Once exhausted or with a non-highest level , you can go on the tiles with green hexagon to be able to recharge the battery level, and start over using skills.

Going up on these special tiles you are transported to another part of the map where another tile of the same type is positioned.