Hey this looks awesome and i cant wait to try it out, but a heads up the APK version crashes when i try to launch it.
Aw this is kinda weird, what is the device you are trying to use it on? You -may- need a relatively new (?) Hardware with openglES 3.2 support, and then it -should- be ok.
Could you try manually setting allow storage permission for Our Paint? Honestly I have no idea why it would crash but this is just me guessing…