Thank you very much for your help.
We have received reports of a bug in the key configuration where the "Weak Attack" and "Decision" keys are set to the same key, causing the player to be unable to proceed from the title screen.
We are working on the mouse support as well as the online beta, so please wait a little longer for the solution.
In the meantime, if you are experiencing this bug, please try the following.
How to initialize the configuration data
1. Delete the configuration data of Lost Epic
Delete the file "Steam\userdata\userid\1426490\remote\Config.dat".
The "userid" is the userid of the Steam client you are using.
Open the LOSTEPIC properties in the Steam client and uncheck the "Save Lost Epic Games to Steam Cloud" checkbox.
3. Launch LOSTEPIC, do the key configuration, and then return to the title screen. Config.dat will be created again when you return to the title.
4. Quit LOSTEPIC, turn on the "Save LOST EPIC game to Steam Cloud" checkbox you removed in [2], and quit Steam client as well.
If you start up the Steam client again, the configuration data will be in a modified state.
Also, in some UIs, the "Decision" and "Cancel" configurations were not reflected, and the default operation was used.
Until the patch is released, you can use the same settings for "Jump" for "Decision" and "Cancel" for "Shingi Button".
We apologize for any inconvenience this may cause.