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.