Hi, this is Driller from Drillimation Systems.
Today, we found out about a bug in the game's multiplayer mode that would cause the game to crash during stage 6 when playing in two-player mode. Big thank you to Dom Robinson for informing us about the issue. We took a few minutes to correct the bug and everything should be good now. Even though the game is still in beta and we're conducting playtests to ensure the game is ready, we're glad we detected it early.
Have a good day and visit Kozankyo today!