Nice game, honestly. I love how the game controls and feels. The main menu is really nicely designed, could use some audio there. The concept is fairly simple but effective to how you platform towards the exit.
I think the exit could us a bit more illumination, to provide a bit more clear indication to where it is (I honestly fumbled around a level dying outside of the world thinking a hole was the exit). Other than that, I had this weird bug which always occur at the level with 3 breaking platforms where you need to reach the rune for the middle block to fall down. Once you die, it gave a black screen. I had to Alt-F4 and after dying 3 times at the same spot I gave up replaying the whole thing again (since it did not save) - screenshot as attached the black screen (bug?)(glitch?).
Overall, a pretty solid game which can be easily expanded into a full game with some extra polish and perhaps more mechanics to the game. Like the slope where the character had problems running up towards. Pity I didn't manage to finish it, but still quite fun!