the game has beautiful visuals, nice music and a lot of potential, but the developer should reconsider the calculations of the speed of threat appearance and accumulation of charges for a strike. maybe I played it wrong, but sometimes enemies appear right next to you, so you do not have time to hit them, and sometimes there are so many of them, and so few charges that it is impossible to shoot. and this is on the first levels! the player still needs time to get used to the mechanics, before he has to do the calculations to save charges and calculate when and how to use them.
I hope my comment will help make the game better! good luck with the development!