What's Wrong with my game? How to debug?

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OS: Ubuntu 16.04 xenial
Kernel: x86_64 Linux 4.13.0-38-generic
Uptime: 22m
Packages: 2450
Shell: bash 4.3.48
Resolution: 1366x768
DE: KDE5
WM: KWin
GTK Theme: Breeze [GTK2/3]
Icon Theme: breeze
Font: Noto Sans Regular
CPU: Intel Core i5-3320M CPU @ 3.3GHz
GPU: Mesa DRI Intel® Ivybridge Mobile
RAM: 1433MiB / 3646MiB

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OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel® Ivybridge Mobile
OpenGL core profile version string: 4.2 (Core Profile) Mesa 17.2.8
OpenGL core profile shading language version string: 4.20
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 17.2.8
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 17.2.8
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions: