I thought it was fun, personally, though the random changes in size could be frustrating at times with some bad timing. It took me a second to understand the game, so maybe a more fleshed out tutorial would help, but I think you have an interesting core loop here.
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Thank you for playing. Random makes it more unstable, but you are right that it being more controlled would allow more to be done for the player. I really wasn't sure what to make for a tutorial, so I went with something simple and put the blocks there for people to play with before playing. But you are right about a more in depth tutorial being needed.