This was fun :)
I like the vector art, really reminded me of good old flash games.
Gameplay wise i really enjoyed the fact that you made this mouse/keyboard playable so that the aiming is really precise, i also like the inventory system and the diary entries in between levels and the fact that items like runes get entries in there after you encountered them as if your character did research on them in the downtime between levels.
Personally i didn't have any particular issue with your game, but i'm just curious because you mentioned that this html version didn't really reflect what you intended.
Anyway, well done :)