Hello, I've went though and played. As I see this is just released I know there will be issues but there are things to improve.
Movement: Its felt very slidy, even looking around did.
Collision: You can't fall down a 1 block hole has to be a 2x2 its a bit annoying.
General UI: Very crude and seems to be thrown together
Textures: Kinda hurt my eyes. If you ever need some help making some let me know Im not great but im here :P
I did enjoy the little challenges, I think as you get more into development you could uses that to guide the player through the start of the game. I would really like to see that done be a good way to get players to play for longer.