That is unfortunate to hear. What version are you playing and what type of device are you on?
Viewing post in game exiting on its own after a fight
I see, in that case it is likely a shader compilation crash which crops up on some android devices. Some of them have been resolved in the latest release of the Godot engine. I will schedule upgrading the engine build for the next update, but that might take a while, as I cannot upgrade until I am sure the build is stable and breaks nothing.
In the mean time, playing the game in the browser tends to fix the issue for most people with this problem (not an ideal solution, I know, but it is all I can offer in the short term).