Never played Hotline Miami, but this seems like that but Touhou-ified. After a bit of time sucking at the game, I got into the groove of things and it turned out pretty fun.
Ended quickly, but it's got pretty much everything for a full-length game, besides the levels. Weapons and controls feel great to use, and it's got this crazy fast-paced energy to it. The shop and augment systems seem pretty cool too, though I couldn't get enough money to afford much (at least, not without grinding).
The story/setting is basically the total opposite of canon Touhou, and that's really cool. I love all the satire of exploitative labor culture and conservative America's stupidity and capitalism. The writing & characterization was great too, and I particularly enjoyed the whole "everything sucks but i gotta work" vibe with Reimu. Fun for the whole family, innit?
That said, maybe there could be more integration of Touhou stuff? These characters not fitting in is clearly intentional, but I think there could be a few more things like the Shield Doll item-- usage of Touhou objects & powers in gameplay & story. Or maybe some more inclusion of the characters and youkai types as enemies-- there's enough Touhou characters that some of them could easily be used as assassination targets. Dunno, maybe that's already planned for the full game.
The visuals... wow. All the filters are really cool, though they did make it hard to see important things at times, so I toned them down quite a bit. Thanks for making them so customizable in the settings. The cutscene art wasn't the cleanest, but it's got a lotta personality.
One thing I noticed was how easy it is to be relatively stealthy. As long as you aren't shooting a loud gun, you can do pretty much anything. An enemy can be two meters away from their coworker being butchered, and not notice because they're not looking directly at the bloody mess. It's really funny, but maybe makes things too easy? Still not sure, especially considering this is only the first three levels.
In short, 'twas very promising.