Hi, first thought when I saw your game 'Oh Tetris? With construction concept??' and of course, I had to play it.
Here's my VOD on Youtube:
I enjoyed the different modes (Contracts) that you created. A little confusing on using the Hold/Discard blocks but not a hard learning curve.
Personally, I would love if there is a Leaderboard in future builds, either Personal Top or Global, especially for the Achiever-type players.
Overall, love the concept, fun game and there is potential to explore more levels.