Not bad, but I have some feedback to improve the game feel. The game needs a better way to start. It's jarring to boot up the executable and immediately be in the action and loosing health and some kind of pausing during the upgrade select. Also, more feedback on damaging the snakes and knowing when they are defeated, for as far as I could tell, I wasn't doing anything. Another thing that was a mystery was progress to the next level, something to indicate that progress like an experience bar or a counter for how much experience was left.