Yes, your Euphorbia is still alive, though it is looking like it needs more sun. If you can, try to position your plant outdoors in more sun. It can take all the sun it can get, use very well draining soil like cacti mix with pumice or perlite. When temperatures are running high like in the 85F to 90F range, it will enjoy good thorough watering. So be mindful of ambient temperatures, if it is getting quite cold like just in the 55F to 60F range, lesser watering/delay watering.
But do feel your plant and check very well if there is any mushy part especially down there at soil level. It hates sitting on very wet media, so it is good to use some chicken grit or pumice to top dress it so the base of the plant is not left soaking wet for long.
My Euphorbia shows its active growth here during summer when temps are in the 85F to 95F range. So it is like a long period of waiting for it to wake up after I overwinter it indoors.
Showing here the growth activity it does when it is awake and finally enjoying the very warm and dry conditions in summer:
File photo taken 21June2016