1st: that jump. Is it even possible? Can't find any proofs on YT people beating it. May be someone on twitch did, and someone have link? All I know now is if you align to block, you can fall into gap between 2-3 spikes, but you still cant jump off - always hitting upper spike if you try to jump and just die to lower spike if dont jump.
2nd: saw on youtube here is hidden world with hidden bosses, called "Horror world", and the entrance located in Cosmos Square.
It not appears to me, is here something special i need to do? Now I did: All stages/bosses in easy/normal/hard (except weramehsin on hard), cleared extra boss, cleared 4 worlds on lunatic, cleared all old bosses, secret bosses Kirby, Megaman, Mario&Sonic. Ofc have latest game version - 1.0.1