Very well done! i saw the game on the Gmtk video i think but i didn't play it in time. The game is very interesting. for the fun part, i guess it's because of the skeletons and the fact that you can't attack them (if you can i probably didin't see how), so it can become frustrating remember where they are... and if you forget it and you swap time very near them, they will take the life point easily (attacking them would make them less of a threat of course, so that would need balance too).
I might not have used or understood correctly the dash. Seems too little of a movement, but i saw that it gives something like i-frames. My suggestion, if you are interested in expanding it, would be to make a bigger dash or at least give a clearer feedback on when that effect ends... and use it more as a mechanic (like doors that close too fast otherwise etc).
A weird stuff but it didn't bug the experience was this: if you swap time when you are inside the tunnel/corridor to go to the treasure room, you jump on the map and enter the room (again, it's just weird, not game breaking).
Overall, well made and great job! Cheers.