Impressive work for a game made in less than 2 days! The concepts and structures are there for a fun and immersive game.
The countdown until the next wave gives a sense of urgency that keeps the player motivated. I liked the variety that your crafting system had, with the different things that you could work towards and build.
If you plan to work any more on this game, I'd recommend more balanced combat and adding in some animations for gathering and fighting.