At the moment the master branch is under heavy rendering changes (and has lots of recent bugs due to 4.0 big changes as well), I'm not sure about the state of the GLES2 renderer in here.
I think there is supposed to be an automatic fallback to GLES2 with the project manager, but maybe it's broken in master.
You can also try the 3.2 branch instead, which should be more stable.