Wow, this looks like a fully fleshed out & polished game!
I had some problem with the basic controls... dash and melee attack didn't work for me (playing with the mouse). Any idea what the issue could be?
Got it! I made it to the first boss (first prince?) and encountered a bug - after dying, the player character didn't respawn correctly (the boss fight restarts the player character is nowhere to be seen and the screen is darkened a bit). I'm attaching a screenshot.
The game is really cool so far! The spear mechanic works well and solving the platforming challenges feels rewarding. I liked the boss design also. The presentation is great, perhaps the music loop could be a bit longer as it becomes repetitive (but that's a minor detail, the overall presentation is a step above most other submissions - obviously this title has been in the works for a while :)).