Thanks for playing first. I know its kind of a difficult game, when i was developing it the first version felt so easy so i had to buff enemies a little bit. Also the speed you have in first two level is same , but in third and fourth its a little bit diffrent as you can tell. Also i made boss fast to make last level harder to finish altough i buffed the chracters speed and damage a bit in last level in order to not make game impossible.
Just saying if you enjoyed the game there is a similar game with better mechanics and multiplayer on my profile i recommend to checking that out. Its called Predict.