I can see this game being really fun to play with friends with a few tweaks!
One thing I would love to see is an indicator of each player's current power level. I can tell it increases when depending on how long I stay in water, but it took me some testing to figure out that the tip doesn't mean water = power on, no water = no power.
Also I keep self destructing by shooting the wall, but I don't know if that's a bug or I just have a skill issue.