Are part time workers eligible for unemployment benefits in Washington?

I've been working part-time at a retail store for about 8 months, around 25-30 hours per week. My manager just told me they're cutting my hours down to maybe 10 hours a week because business is slow. I'm wondering if I can file for partial unemployment benefits through Washington ESD since I'm still technically employed but my income is going to drop significantly? I've never dealt with unemployment before and I'm not sure if part-time workers are even eligible. Has anyone been in a similar situation?