I enjoyed the puzzle aspect of your game, It was fun to try an figure out. The theme was also super fitting. For your first game in such a short time span, this is really good and you should be proud :).
one comment I would have is when introducing new blocks to the player, I wasnt really sure what they did until i shot at them. I did notice you had a tutorial screen showing them al but I couldn't remember all the blocks XD. But otherwise great game, i did enjoy it :D