Wow, really cool game! I really had fun and enojoyed the presentation. I have a few little nitpicks:
> enemies really close to the bottom of the screen felt a bit unfair
> later basic enemies had too much hp and were tedious to kill
> The rank is a bit unforgiving if you ask me. I didn't feel like i was doing that poorly but still go an F :D
Also, the kill count is kinda useless if there is no way to game-over and enemies don't despawn
Yes I do think the rank might be a little unforgiving. I took my own average score throughout testing and gave myself a "C", but now you know if you get better than a C you're better than me ;)
Yeah some of them prolly have a bit too high in HP near the end, and the enemies near the bottom are annoying too. If I build this game out further I want to consider having more live movement in enemies that sink to the bottom and come back up, but the stationary ones will stay near the top.
