I really enjoyed it! I just wish the winning objective was "get more damage" rather than "kill in less shots" for the sake of a higher skill ceiling and better correlation between rating and skill.
At the top level it's just about consistently killing in 8 shots, because I'm pretty sure it's impossible to kill in 7. And while 8 is difficult, with a decent level of practice I think pretty much anyone could virtually always achieve it, so unfortunately there really is a solid skill ceiling beyond which you can't really improve.
Also sorry Nick, your AI nearly managed to kill me in 8 shots but not quite.