Hello. It looks like Lenovo Miix 630's GPU is Adreno 540, which does support OpenGL ES 3.2. Pixelorama requires OpenGL 2.1 minimum, so it should be working. Do you have the latest drivers installed?
It is possible that this happens because your computer has an ARM-based CPU, while Pixelorama's binaries are x86/x86_64. It seems that currently there are not much we can do about this, as Godot, the engine we are using to develop Pixelorama, does not currently support ARM support, neither for Windows nor Linux. Your best bet right now may be to use the Web version, or, less trivially, compiling Godot yourself. I did some research and it looks like someone else with the same computer as you had the same issue with Godot. https://www.reddit.com/r/techsupport/comments/luav2n/opengl_problem_with_godot/