Reminds me of rocket sword.
I discovered I can heal in the comments after playing a few times and after that it was too easy. You can just mindlessly go in one direction, sometimes clearing red enemies as a precaution. Discovering healing immediately removed all tension and excitement from the game, which made for a decent experience.
The combination of viewing range, screen panning delay, amount of enemies and lack of direction indicator makes me not want to use any more clever maneuvers.
Laser is too good as it's efficient at erasing red enemies and you can use it to offscreen enemies or detected them like radar. It also always shows current facing direction, which is something that is lacking otherwise to help with precise control.
Visuals are great, I love the background and water speed ripples are something I always wanted to add to my games.
I wish I could dogfight and play chicken with enemies, but the current concept wouldn't be able to handle that.