I was initially using a laptop trackpad, then following your message I tried plugging a USB mouse into my laptop. It works with the mouse, not with the trackpad.
Here is the output:
Playscii v0.9.12
Loading config from /home/myname/.config/Playscii/playscii.cfg...
Config loaded.
Detecting hardware...
CPU: x86_64
OS: Linux-5.2.2-arch1-1-ARCH-x86_64-with-arch
Python: 3.7.3 (default, Jun 24 2019, 04:54:02) [GCC 9.1.0] (64bit)
Modules: PySDL2: 0.9.6, numpy: 1.16.4, PyOpenGL: 3.1.0, appdirs: 1.4.3, PIL: 6.1.0
SDL: 2.0.6 hg-12373:8feb5da6f2fb, SDLmixer: 2.0.0
Detected screen resolution: 1280 x 800, window: 1024 x 640
GPU: Intel Open Source Technology Center - Mesa DRI Intel(R) Ivybridge Mobile
OpenGL detected: 3.0 Mesa 19.1.3
GLSL detected: 1.30
Vertex Array Object support found.
Maximum supported texture size: 16384 x 16384
Loaded key binds from /home/myname/.config/Playscii/binds.cfg
init done.
Thank you for using Playscii! <3