Bug: on stage 43 the portal does nothing, it has no information so the game just crashes, there's also several random portals that do nothing since I saw when I decompiled the see what the issue was.
Feedback: the game overall is pretty fun, interesting jumps. but the lack of a consistent center screen is weird and the way you used the warps can be simplified with another object.
I recommend creating a template screen with the warp player and save added then adjust as needed. the object the simplify the warp sequence would be the following:
sprite: sprWarp
contact with player > code:
with(other){instance_destroy()}
room_goto_next()
