Most times I obsessed over this kind of details, but I didn't even consider making a different sound the closer you get to matching the block. I think it would be a great indicator and also give you a better satisfaction factor when playing, like when you press a button or close a door. If you don't get that clicky sound, you know that something is just not right, so I'll keep it in mind.
In the beginning, the game was supposed to randomly generate the structures, so it will just be and infinite game, making you play for a high score, so the replayability would be even greater, but time constraints for submitting it to the jam make me focus on things about the core mechanics, like the matching blocks' system (The thing that gets how similar the blocks are to the shape in the background), so I'll update the game soon to add a few of these things.
Thanks for playing it ;3