Graphics and sound effects are amazing! I love the art style. As @danmakesgame remarked, I also think different controls would be more comfortable. Suggestions.
- Tap left twice or right twice to dash.
- Tap down twice for meteor slam.
- Z for jump. (twice for double jump)
- X for attack.
- Space for interact. This would be consistent since you already use Space for dialog advance.
- Shift + arrow keys to walk slower (facing same direction), which would also cover the backstep.
I found a bug: after I fall from the ledge where there's a slime enjoying a cigarette, I land on the spikes and get stuck.