There really is something special about games that do so much with their mechanics in a 2-3 hour timespan that you don't mind replaying them 5 times in a row. It's enhanced somewhat if you're already a Touhou fan, but the game is so incredibly captivating by itself - in terms of gameplay, level design, and music - that any knowledge on the series is optional.

I used to not be into speedrunning.

Used to.

It's literally Supreme Commander but better idk what else to say. Wish they made a sequel though !