Thank you so so much for the feedback! As you mention, the game is complete, but I greatly appreciate having detailed and actionable feedback like this.
I feel that this game, generally speaking, suffers in some places from having an unbalanced difficulty curve (and some mechanics certainly don't help, with the guns being possibly the worst offender). Sadly at the time I lacked the experience to solve design issues like this, and I started inviting others to playtest too late into the dev cycle... but excuses aside, it was definitely a learning experience, which is why I'm happy to see feedback on where exactly I flunked.
I'll likely revisit this sort of game at some point in the future. I will definitely be keeping all of this in mind!