Felt like a solid framework for a good platfomer. It was a bit lacking in the graphics and music department, although I can totally get why since you mentioned being a solo developer.
Some chase sequences, like the medusa one that mix horror with gameplay tension could really shine if given a proper chance with better music and graphics.
I only managed to get to the third level (although I definitively would've gotten farther if there were proper controller support, I'm not too used on playing platformers on keyboard) because the rock falling section required inputs a little too precise.
I did manage to get past it twice, one time I fell into a pit right after, but the second time I got past it something funny happened: a rock still managed to crawl and fall down the ending of that section, so I just got hit by a boulder from off screen. Tried to record it but screen capture wasn't on. Was funny.
As for the rest of the game, with the enemies being essentially sitting ducks (up until the point I reached, anyway) I felt it would've made the combat more dynamic if the dash also dealt damage, or the base attack had longer reach.
That aside, nice game