Nice game! I like the execution, my only nitpicking is that there is not much of an upgrade tree, and after a few days you just accumulate money without any real use for it. For those struggling with difficulty, the key is to earn MONEY as fast as possible, not to kill as many enemies as possible. Headshots give $10 per kill. Since heads are usually armored, the strategy is to get the hardest-hitting and accurate weapon--the heavy xbow and steel shafts. This costs $170+50. Spend the early rounds going for headshots (it may take 2-3 hits with the default equipment). It should only take 4-5 days to get enough to get the heavy xbow. Get the long tail and bodkin next and you should be nailing headshots fast enough to upgrade all the supports pretty quickly. I'm usually done upgrading by day 15 or so.
Nice artwork and animation, it's quirky and weird without being creepy. I agree it's too easy--the gameplay is fine, but it seems like you can upgrade way too quickly. Perhaps simply increasing the cost of upgrades would balance things more. As it was, I was able to get the best weapon by replaying the 3rd mission just a few times.