Thank you for you honest review! I think the control behaves like it should, but you are right, its actually very hard to predict the players movement on the platform while changing the speed of time. However we wanted test some new game mechanics and ended up with this :) half into the jam we knew it is more about luck then skill but there was not enaugh time left to change the game idea... anyway we had a lot of fun while developing it and most of our friends actually finished it . one thing we heard more frequently was: "it drives me crazy, but i want to finish it".
we didn't had time left to implement an online leaderboard, but there are a total of 58 coins in the game, of which 16 are at the finish line. so your score is pretty good considering you did not finished it.
regarding your feeling on how to rate this: i think you don't have to finish the game in order to adequatly rate it... it just goes on raising the difficulty. moving platforms and coins is all we got :)