Happylisk found a serious bug with the new collision warning system introduced in Alpha 2, enough to warrant an immediate hotfix. And thus Alpha 2c was born, coming with a couple of other simple fixes made in the meantime.
The full Alpha 2c (0.10.150726) changelog:
* FIX: Crash on ramming and destroying a robot before the collision warning indicator blink duration ended [Happylisk]
* FIX: Crash on running without an enabled audio device (now no such device required) [jimmijamjams]
* FIX: Manual map object labels left open before transitioning to a new floor would remain, pointing to nothing
(Note: With Alpha 3 I'll be adding a feature that allows for hotfixes like this to retain save compatibility with earlier versions, so that minor updates don't fake the game into thinking "oh my it's another version it must not be compatible!" But I haven't added that yet so the game won't let you use previous saves with this version :/)