I used to be an hardcore gamer but I'm fairly casual now. I cannot last more than a few seconds.
I'd say the game requires a very accurate estimation capability. The enemies are large in number since start (so I cannot even tell if they follow a pattern or not) and the size of their bullets are massive compared to player's.
Personally, I haven't noticed any strategic component at all, it's just a matter of converging functions. Each enemy appears to require a few shots to go. Your ship takes a few shots to go. There are more enemies, and their bullets are bigger so there's basically an order of magnitude divergence to overcome. I suppose letting the blast charge is key, this would require some tactics, it might be possible as the player is experienced, but with no chance at understanding the mechanics in 10-second bites, my determination rapidly declined.
The language used by the game does not say "it never ends", it says "it ends now".
I'm not sure but... do you get damage by hitting the borders of the game area?
How often are you adapting enemy ships?