Emailed you but I'll post my feedback here too:
The game is soooo awesome. Especially the grappling hook. I discovered so much awesome movement already. I was able to get 8 power chips and I'm pretty sure I discovered all the debug areas, including the graveyard and your checklist. And the charging while not shooting is so smart. Took me a while to figure out but it's great. If you added a slight pushback force on the charge shot when swinging, it would add a TON more movement options too. Nothing too strong, just enough to get around a corner ledge with a well placed grapple for example. It could also boost chain swinging speed for really crazy speedrunning.
Took me like 10 minutes to get to the regular ending, would've been 0 deaths if not for the crash which made me redo the boss and die once. Explored the world with the grapple for like 20 more minutes.