Update - The game still needs some improvements to release.

Due to the time, I canceled the multiplayer mode.
I hope you will not be very sad, multiplayer mode will be released after the game is released through the game update.
Custom levels are not currently supported, but I've implemented a custom language and the game may support the Steam Workshop for you to upload custom language files.
Finally, thank you for waiting, if there is no problem, the game will be released this month.