Maybe I missed something but I got completely stuck on level 3! And then I think solved the last level through a bug of the boxes getting stuck together. Maybe I'm just thick but some more tutorials/explanations/simple levels would have helped. You've got a great idea though and did an amazing job! Will look out for your next game :D
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Thank you for the kind words!
Yes, a few more tutorial / easier levels would've been a very good addition. I suppose I was unsure how people would find the difficulty due to lack of playtesting.
SPOILERS BELOW
As for the final level, you did find the intended solution! The boxes getting stuck together should be the only way to solve the level, so congratulations on finding it!
Thank you for playing!