That sword feels pretty useless :D Especially against the spiders. I think it could be buffed a bit so you can safely take down spiders with it, because right now I still end up running away from everything, just with a sword in my hand.
By the end, I was really looking forward to getting a weapon. I was happy when I got the gun, and unlike the sword, it actually felt useful. But before I could really enjoy it, the game was already over.
You could add a few levels where you can make good use of the gun. It doesn't have to be difficult, it would just be nice to finally get that satisfying feeling of being able to shoot things freely.
Overall, I liked it. It felt more like a puzzle game than anything else.