Song is Ultimate taste by ぱらどっと / 粒良ぱらこ (paradot)
basically, month-long april fools special, the sixth
(get it
its the sixth because touhou 6 lmao)
T3-X-ish level!! again!!!! wow!!!!
going through some arbitrarily selected official levels with un owen blasting in the background in every genre imaginable (well not really but you get the point)