I think this game is pretty well done! There were a few interesting puzzles in there, and I liked the approach of using optional items to provide challenge; this gives an inherent 'out' if people get stuck, which is always important when making a puzzle game. The gimmick of controlling the aliens with your own movement was interesting. I didn't really like the way the aliens behaved when they weren't directly following my moves, however. The way their movements mapped to mine was very unintuitive, and I found myself fumbling with the controls a lot on the last level trying to get the aliens out of the way. I probably would've preferred the controls to be reversed in that circumstance rather than the weird control scheme that was used. I also noticed the alien movements seemed pretty glitchy in those cases; it looked like they were trying to match my moves, but then jerked in a different direction, which also seemed to sometimes cancel out their moves if I moved too quickly. Those complaints aside, this is a pretty respectable base for a solid puzzle game.
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First of all thank you very much for your thorough review! About the movement of the aliens you got it right, in the state where you change only the alien's movements there is a glitch and I couldn't fix it for this Jam, as a narrative I usually say that the aliens are trying to deny being controlled :-)