Not bad. The day/night resources/monsters loop works nicely. The biggest problem is that during the day phase, I was mostly just waiting around for resources to spawn. There wasn't anything else to do. At night, when the monsters attack, the way the sword always points right or left makes it hard to hit enemies above or below you, making me vulnerable. If I got hit, and I did, I never was able to get enough ore to make potions to heal fast enough.
The game's lacking in depth. There's nothing really to do outside of combat and resource mining which often involves idling about. I was at a point where I was at one heart from the mentioned difficulty hitting enemies, and the pressure increased. I tried to survive until daytime, where I could then mine all the resources that spawned at night to hopefully make a potion. But I died. That was on day 5. It took a while, so I ended it there. So if that was polished up a little more, if the timer was hastened, or other mechanics like hunger was added, that'd improve the experience. As for everything else in the game, it's nothing special, but it works well enough (graphics, music, premise). So while I had frustrations, and wouldn't play it for a long time, I still had fun with the game.