yeah, this rules. great atmosphere both visuals and audio, and you got the balance right on difficulty too. i really enjoyed the different uses for the block(s) to keep it fresh all the way through.
here's a lil critique for you. it would be good if the enemy protogens had some kind of other behaviour when you have them boxed in, that makes them more aggressive and frightening to deal with. when you first see 'em its like "uh-oh" and you want to avoid them for sure, but then you get them trapped against a wall and they just bounce around and they sorta look like they need help :D maybe they could start to smash down your block or something like that?
anyway feedback aside, i had a great time with this one, one of my faves this jam. excellent job everyone :)