Really great central mechanic, I think that's a strong foundation for a platformer. I especially enjoyed the part near the end of level one where you had to throw it down and it had to bounce like 5+ times to reach the next section. It was very fun to watch it hit all these bounces I didn't even know were there. My biggest suggestion would be to let the player throw while jumping, and to let them teleport while it's still flying—I think these would really open up the scythe throw to being a satisyfing movement mechanic more than just a puzzle one.
Played until I got softlocked by teleporting into a section with bounces on every surface, but had a lot of fun until then!