I think in some places I was able to complete levels despite thinking I'd made mistakes. Was I supposed to survive going through the flying boys when they were standing on the ground? And sometimes I wasn't sure if I was dying and respawning or if I was getting teleported because I managed to get to a place I should be going to. But it did however seem clear what I was supposed to do. Having instructions within the first level was nice.
The font was a little bit hard to read, but that just made me progress a bit slower when I had to spend time reading (and I think I respawned for taking too long to read something). You could have used some music, and some more sound effects (for walking and jumping... though I didn't make a jump sound effect for my own game, so I guess I shouldn't be too harsh against other games for lacking the same thing I didn't have time to make).
As for the theme: teleporting made it a bit hard to navigate and feel like I was going "there and back". And the collectibles increased the time limit? That's nice. This is the first game I rate, so I might adjust the score when I've seen what the other games are like on average.