Oh I see now, thanks for providing the GIF. That jump across that gap is actually intended to be impossible until you go back and get another powerup from a small area to the left of where the game started. I realize now that the jump does look like it could maybe be possible, so it's not clear what needs to be done. I think I'll put a note on the game page for now until I can update the game.
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Great, thanks for giving it another go! You're right, it looks like I forgot to actually add a check in the code that you have the doorway powerup, lol. The game is supposed to be a metroidvania, but since my game is so linear up to that point I totally understand that needing to go way back isn't obvious. I was running out of time before the deadline to put more work into the level design, but for this genre especially I wish I had dedicated more time to it.