Very fun! Only got through to level 4 and barely passed it by the skin of my teeth, so I stopped there. As others have noticed, there are more blocks disappearing than are touching, but the gameplay feels fun and I like the different colors/textures of the blocks to help with distinction between them for colorblind folk ^^
I have noticed that pressing "quit" at the end doesn't work, but that's a minor thing all things considered. Really good job so far, and thanks for sharing the link on bsky - it was a fun little challenge to play with :]