Fun game, movement felt fluid though combat felt slightly clunky at times, I found that dashing was a lot more powerful than normal combat (which wasn't really a bad thing as I felt only dashing made combat feel a lot smoother and more skill based) so you might want to consider doing some balancing when it comes to normal combat (I'd suggest upping the default attack range).
The game was very bug free and the enemies well balanced. I did find a bug where you could dash onto the lake and get stuck, however dashing again seemed to fix this. Also as a final note I'd suggest upping the hitbox of the rocket giants as it felt as if only their feet could take damage, I'm unsure if this was intentional or not though I often felt as if I was missing dashes which should have hit against them.
Overall I enjoyed Heart Of Gold and I plan to play more.