My computer resolution is too high, so your text is super tiny and hard to read. I think the overall concept is really cool, once I figure out how it worked.
I don't think you need as much text if you make some simpler levels in the beginning, like do a level with just the heart and energy. Then have just one enemy. Or you could make a video BETWEEN levels.
Music is and aesthetic is nice and simple and fits the computer vibe well. Did you make this whole concept with music and art in just these few weeks?! O-o
The puzzle system is quite complex, and I kind of suck at it, because I cannot predict the enemy pathing (plus they move multiple squares when I only move a few).
I don't see any "bugs" so far as I can tell. It feels pretty solid, other than maybe some balancing with health, energy, blocks, and enemies. :)
Oh what, I just discovered by the end of this post that you can rotate the packet before you send it! Haha!
Oh what, the enemy can shoot away the blocks!