you asked for feedback so here it is ( :
1: instead of saying collide with door to get to level 2 you might say like enter door for next level or just put a text that says next level
2: the flashing text is kind of annoying
3: nice game
4: you can start easy and make it harder over time
5: you should say the controls in the game, and say it one by one like in level 1 you might teach the player how to move and jump but in level 2 you can tell the player how to double jump and crouch.
6: nice font
7: nice smooth camera follow