Its a great idea for a game and I'm a big fan of the artwork. The simplicity of the theme really stands out for me and i like the tile map you have used. The explosion effect is great and gives the character a sense of real power!
However, I find the controls a touch unresponsive. Personally, I like nice crisp controls that make me feel in total control of the character and there were moments that I felt like she wasn't responding enough. I think you could maybe decrease the deceleration time for movement so she comes to a stop sooner as there were a couple of moments where i fell off ledges into spikes due to momentum.
Post Jam this could be expanded into a nice little story! Keep up the good work!