I just finished the main bit (without the secret boss) and had a lot of fun!
Did you get stuck or frustrated at any point? If so, where?
It took me a few tries to defeat some bosses, but nothing out of the ordinary I would say. I am not an experienced danmaku player, and I also have a weird hangup about trying not to use slowdown items in games unless completely backed into a corner. I had no issues with the environment puzzles. I opted for the simple riddles.
Did you enjoy the combat? Were any of the mechanics hard to understand?
I did, the player is fun to control. I started playing with mouse and keyboard, and had a bit of trouble keeping my aim on the bosses as I would sometimes lose track of where the targeting reticule is. When aiming with the mouse, the reticule's positioning is affected somewhat by how the scrolling will lock against the boundaries of the map. After the first boss, I switched to an XBox 360 gamepad and found it easier to target the bosses.
Did you enjoy the dialogue and story? Did you think it was funny? Did you think characters were too wordy?
I enjoyed the NPC interactions. The contrast of cheerful characters against a gloomy atmosphere worked pretty well. Love the music.
What difficulty did you play on? Did you find it appropriately challenging?
Intended Experience. I felt it was reasonable.
How did the game run on your computer? Did any parts perform poorly? (If so, it would help me if you could post your PC specs!)
I experienced some dropped frames and performance fluctuations on the first boss as it got closer to defeat. I don't recall having any technical issues during later fights. Here are my system specs (this is an old Windows HTPC that I recently dug out of storage)
OS: Windows 10 Pro 64-bit, Version 1809
CPU Make/Model: AMD A6-6400K APU With Radeon HD Graphics
CPU Clock: 3.90GHz
CPU Logical Cores: 2
RAM: 4 GB (DDR3)