Really nice, the music is great and very fitting. Did you intend to make a base building aspect too? I couldn't work out what the prompts for Space and Tab were used for? Otherwise a nice game with a nice aesthetic.
Yes, in the game you can build towers and a castle, for this you need to collect bricks, which can be obtained from the blocks. The problem is that I did not have time to make a normal tutorial... Thanks for the feedback!