This is a great metroidvania! The central mechanic of using the spear in platforming felt really unique and helped give a freeform feel to exploration that works incredibly well for the genre. It also led to a nice blend of skill and timing-based platforming with some almost puzzle like elements figuring out the best placement for the spear - love it!

The world design so far is really polished, with details like the shortcuts opened up by the seed power making backtracking through previous areas feel effortless. The environments feel huge and mysterious, but thanks to the map I never felt lost or overwhelmed, just intrigued to figure out the route forwards. 

Nice job! The music and art makes a very calming atmosphere. I like the spear mechanic as well! I did notice that the spear does not automatically return to you when you transition to a new area, so when I encountered the first boss, I was waiting 10 seconds for the spear to return lol. The map feels very spread out to me, so maybe adding fast travel checkpoints or introducing dash sooner might help?