After losing on the 4th or so mission, I quit the game yesterday. Coming back to it today, none of the buttons work on the main menu except Steam / Survey. It appears to be a result of clicking the continue button.
Hey that sounds like the game ran into problems loading your save. If you don't mind, could you email me your save file to contact@spiritlinktactics.com ? The save file should be at "%userprofile%\AppData\LocalLow\Flanne\SpiritlinkTactics" named "v3_save_0". It would help me fix this bug, thanks.