Hey Man, i tried and i like this a lot. (i'm not native speaking english, but i will try express me)
I spend like +2h and conquered 50+ bases, found 3 bug and have some sugestions:
BUG:
-the number of base conquered change for 4 in the "boos fight" and in next sector change for normal
-when you are a max ugrade, in the 3 first weapons when you click in de upgrade buttom, you gain the cost of the upgrade in money (the two types)
-when you are in the menu upgrade and you click em menu buton in de corner, the graphics change likewise you activated and deactivated the tactical pause
Sugestions:
-make a speed upgradeble in the ship
-make a guided missile for player and enemys
-make small enemy, more fast
-make the huge enemy more huge and more resistent, is easy defeat 4 at de same time with high upgrades
-the order of de "money" in hud and in menu is not de same, make this confusing (the process to upgrade, collet money, and healing is confuse too)
-put more them one node to trace a trajectory in de tatical pause (can be a upgrad)
-make the "fog of war" more dark
-in high level this game gets unbalanced (easy , you kill fast, but the enimes can kill you fast to if in groups)
-make the "boss" huge one come with two fast and weak patrol ships with him
I hated de fact of enemy can go outside screen em return healed [rs] and i cant use half speed pressing shift
in general is a very good and optimizade game, the art is very beautiful, i like this, great work