Good game! I liked the Idea that you have to manage 3 resources and you can strategise about if you want to trade time (shooting asteroids) to healt, rocket or dash.
Though there was a HUGE difficultyspike after getting close to the person we're saving in the mission. After that the game just gets unplayable. The enemies have waaay too much health and that combined with this low visual signal, makes the player feel like they are only scratching the ships. The number of enemies you have to fight at the same time is too high as well and on top of it all, the bullets are really fast. (the bullets aren that bad, but combined with those mentioned above, these 3 make the 2nd half of the game unfun)
I think it would have made more sense to make the rocket deal damage in an aera. Ista-killing an enemy is useful and all, but does it matter when there are still like 12 ships shooting at you? I think the insta-kill could stay and there could be additional damage to other ships. If this is how it worked already I couldn't notice it, because the lack of visual feedback.
I generally like the concept, the idea and the game. I just highlighted some issues so you can understand, why am I saying certain things. The game IS still good. (So it's not just me being harsh, rather trying to give you constructive feedback. Not sure if you could tell ;D )
BTW if you could visit my game too, that would be really appreciated.