Castlevania | Castlevania NES | Game Engine library

I have been trying to make my enemy spawn every 20 seconds to counteract the fact that the enemy gets stuck underneath platforms when it is directly bellow the player, I have left the method that I was going to use, however I have not had much luck implementing it.

The plan was to use the timer.tick built into python to be able to time every 20 seconds, however I realised that this just worked on the frame rate, as you can see at the top I used start = time.time() to begin the clock, and then write end = time.time() to end the clock after 20 seconds.

I'm trying to make a transitioning system similar to something like Castlevania, where scenes have multiple exits and entrances, although I'm having trouble changing the players position dependant on which entrance they use. I'm also trying to keep it all changeable on the fly with the one script.

TL:DR: Need help changing the position of the player when they transition.

I have been making a 2d platformer using pygame, and have introduced procedural generation to my code, however I have found that sometimes, my platforms cover my exit block making the level impossible to complete, I have tried moving the exit block to reduce the chance of this happening, however this still doesn't solve the problem, rather sweeps it under the rug. Does anyone have a solution?

I'm new to coding and I have recently been trying to make a 2d platform game and have run into a problem that I can't seem to solve, my NPC won't follow the player around the map, nor will it react to collisions, any help is welcomed.

I have also been considering creating an algorithm that will procedurally generate my levels within the box of platforms, and place the exit block somewhere else in the level, how do i archive that?