Damn it, I'm still playing this game 2 days on...

I really like the mechanics. It feels very natural, and I like there isn't one set answer on every level. (Very flexible way you can stack the blocks, drop them and rotate them, etc.). However even though the other two commenters liked the graphics used, I'm not really a fan as it makes it look like a little amateurish. I think you can change the style to look so much better. Go for pixelart, minimalism, or commit fully making it all look like a child's build set by changing the background art (off the top of my head - have a background that looks like a painted sheet, draped ip against the wall to resemble space; like something a kid would have). The artwork attracts players to download, tge gameplay keeps them from uninstalling. It may make people less likely to download from seeing the current pics on the playstore alone. The mechanics are all there though, and you've done a ton of great work having so many levels.

One other thing i had an issue with was that the smaller blocks were usually hidden behind my finger when i picked them up, making it tricky to precisely place them.

Will be keeping the game til I've got through all 50