As smooth as I'd like it. Nitpicks:
-R is for restart
-Escape is not for quitting, preferrably menu/pause
-V formation enemies ignore walls
-If holding to shoot works for one gun, it should work for all of them clicking second weapon 2 is annoying after using wep 1, even more so that you're forced into a cooldown after a some clicks
-pop sound effect is nice, didn't like the music
-weps 2 and 4 felt the exact same apart from the visuals
-wep 3 is fun to use
It's alright, but the quality of the game rests on the enemy and their sequence design, which is not in this version.