I purchased the DLsite version.
To cut straight to the point, I couldn't clear the first boss.
Why do they hide the button instructions so that they can't be seen, even though it's a rhythm-game style QTE? If the first instruction is hidden, it should be obvious that it's a complete game of luck with four options, right?
Be careful, as the unreasonable luck-based elements only ruin the fun of the game.
I bought it because I loved the worldview and graphics, so it's a shame.