Pretty cool game! The mix of resource harvesting, building, and tower defense works really well.
The movement feels a bit clunky, especially with the elevator, but that’s understandable given how little time you had to make the game.
This game has so much potential! You could expand it further by enlarging the map and increasing the tower size (maybe to 3x3) and introducing more resource and block types.
I absolutely love the concept, amazing job!