That was really fun! The art and soundtrack are pleasant, and the gameplay is addictive. The arcade and puzzle elements mix well.
My main criticism is that, because of how long it takes to retrieve a piece, large pieces are much more valuable than small pieces. Clearing lines is the best way to get score, and clearing lines is limited by the amount of blocks you have, so the #1 priority became shoving as many blocks of material into the compactor as possible, meaning I was mostly utilizing my keyboard reflexes and deprioritizing 1-blocks, since even taking them back took more time per-block than just finding a larger piece nearby.
While I do think the time & distance aspect of the game is good and creates an important scarcity, I think the amount of 1-block and 2-block pieces should've been increased slightly. Having more small pieces would decrease the massive incentive to shop around for those 3-block and 4-block pieces.
All-in-all though, fantastic! Great work!