Thank you for all that feedback!
And you're right on the money with all of design points. They were all intentional and I'm very glad you perceived them as intended difficulty. The challenge IS planning where you should go next as well who NOT to shoot, you're 100% correct.
The submission 'after just half a day' was just the page. Any builds you update it with will not update that timestamp.
We try to have an MVP and publishable page by half-way through jams, so we published and submitted to the jam a playable version halfway through, but it wasn't this version... or even this game! We started out with a different game that by halfway through, didn't quite work out for a number of reasons. So we decided to pivot and made Arrows Left in a little less than 24 hours, the 22 last hours of the jam, to be precise.