Indeed, level 3 it's maybe a little too hard for level 3 - I think I will make it level 4 or 5.
Regarding the delay of the dropping platform + notifying the player, I will more than sure add those. I'm thinking about making something similar with traffic lights: green you can jump on it, orange it will drop in 0.5s - 1s, and red it's dropped.
Glad that you've played and liked it. In the mean time, I added some new small but helpful details. I will update the game pretty soon, after adding these modifications too.
Thanks again! :)