The perfect rage game.  I agree with the previous commenter that starting a bit slower would probably increase the fun, right now it's very unforgiving.  Another option would be to have the rewind function always be available, but with a cool down, so it's a gamble to use it because maybe an unavoidable obstacle will come right after. 

Would appreciate if you could have a look at my game also. It's only my second game ever, only started with gamedev earlier this year.