Thank you so much, this is really helpful feedback!
Since you mentioned that you were easily able to complete some levels after learning their movement patterns, it makes me wonder if the game needs some work towards the replayability aspect. It wouldn't be as fun to play the game again if you know where every surprise time change is.
The reason of why every symbol besides the pause doesn't flash is because I wanted to have some sort of "surprise" aspect of time changing. However, I could see that there could be some unfair moments if the player doesn't get some sort of warning that time is about to change, like if a player were to time their jump over a missile and the missile suddenly stops in place at the worst time. Perhaps in a future update I could have the symbols flash quickly for half a second to warn the player time is about to change.
...Also "PlatformingThing" is what happens when you let brain-dead tired Liam name your games at 4 AM